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Hello @Barrie1952
Welcome to the Bunnings Workshop community. It's sensational to have you join us and thanks for sharing your question about installing Prempanels.
I propose doing it in sections so that it will not be extremely difficult. I suggest measuring the distance from the wall to the edge of the window frame. If the edge of the panel lands on either the gap or raised section, I recommend positioning the panel to what is convenient for you. This technically will leave a gap at the front near the wall which you'll need to patch with a piece of the Prempanel later on. For accurate cutting, I recommend using a Multitool with a Kango 35mm Aggressive Tooth Plunge Cut Multi Tool Blade 3 Pack attached.
It is critical that top and bottom section of your window be thoroughly measured to make sure that the cut is in line with the frame of the window. There is no guarantee that the frame itself is square and a section of it might be higher or lower than the other side. If you take your time and plan accordingly, the installation of the Prempanel over your window should not seem too daunting.
Let me call on our experienced members @Dave-1 and @Nailbag for their recommendations.
Please remember to wear personal protection such as gloves, goggles and a mask when cutting the Prempanel.
If you need further assistance, please let us know.
Eric
Hi @Barrie1952
Nice choice for a feature wall 
As a feature wall with out seeing a photo of your room consider pulling off the timber frame around the window or cutting it flush to the wall.
The idea is the panelling will sit flush with the wall right up to the window opening no timber window frame showing.
Or consider a black painted window frame.
The panels will fit around the windows and will look good regardless of whether the panel oak studs line with the window edge or not I feel. I think as a feature wall the uniformity of the wall is most important because it is the feature. Not the window. What I am saying is start one side of the room and panel perfectly uniform oak timbers and spacings is the selling point for my likes. Let the window sit where it will and do a cut out/
However If i understand you correctly you want the oak studs to perfectly frame the window sides no black gap to the window.. I dont know if that will work what are the odds the window width will have the perfect spacing in between to match the oak spacings?
If you change the oak black spacings to uneven the wall would look more like a Dopler shift wall.
You will need to cut the panels shorter to fit your room.
So do some measurements as to pre test how and where the panels will fit that suits your self. Use the offcuts to place along the wall to get a real feel and pre test for whats possible and what you prefer.
Hope this helps.
Afternoon @Barrie1952
Id also like to offer a warm welcome I must say I am itching to use those panels as well.
Having a feature wall will definently bring your room to a different level. (envy is what i have atm )
Just had a thought about any curtains you have and to factor that into the paneling.
I do like @EricL 's suggestion of doing the job in sections to make it more manageable.
I just went to have a look at the Prempanel 2700 x 600 x 21mm Oak Timber Acoustic Panel and hadnt realised its 2700mm tall. That kind of works in with an idea I have to install it, or better visulise it.
Why dont you cut say 40mm width strips off the top of the sheet (making sure that you dont end up with less then 2400 of it in a length) Then you could temporatily tack them to the wall just above the window frame to determine where the joins/strips will end up. you can then jiggle it around to make sure it works.
Alternatively You could frame the whole wall like a picture frame and or frame around the window. That would also potentialy cover up any imperfections in the squareness of your walls.
Im still trying to figure out a nice way to attach the curtains (unless they are attached on the window trim itself) Mmmm
Looking forward to seeing this project for sure Please take a bunch of photos and maybe consider a post in the "project" tab afterwards
Dave
Thanks for your advice
Im not worried about having the studs of the prem panels line up on window frame just as long as I have even space around all
Got some photos here
Just concerned about matching underneath and above
Cheers mate for your help
Hello @Barrie1952
Using a Multitool will give you a very precise cut especially when cutting uneven surfaces such as the Prempanel. My best advice is to practice on plywood offcuts first before you commit to cutting the Prempanel. With enough practice you should be able to use the tool with confidence. Please make sure to mark the surface so that you have a clear-cutting guide.
If you need further assistance, please let us know.
Eric
Thanks Dave
Everything you say makes great sense
Blinds aren’t a problem they are attached to frame and are removable
One of my other concerns is after working out side panels in relation to being even look is then matching up top and bottom of window without having a noticeable gap
Sent some photos Dave
Hi @Barrie1952
You might need to use a high-quality blade when cutting through the oak studs.
Here is a handy guide on how a Multi tool works: How To Set Up and Use a Multi Tool
If you need further assistance, please let me know.
Eric
