Looking for guidance on getting my front yard done

[DC15]

I have a patch of 5m X 3.2 in the front yard which I'd like to do up so I can plant some roses and other flowers. Before planting anything, I'd like to first structure it out with some garden edging and concrete sleepers in 2 rows. I have attached a plan I've put together.  I wouldn't want to cut the concrete sleepers, so looking to put sleepers that would best fit in the space like Pioneer 200 x 75mm Ironbark Reinforced Concrete Sleeper which are available in 2m and 2.4m sizes

• Planning to start off with some garden edging like Matrix 400 x 900mm Charcoal Foliage Garden Edging at the furthest end. Would like ideas here.
• Then use concrete sleepers in a U shape to plant flowers around. Wondering if Jack 50 x 450mm Galvanised Steel Retain It Corner Post Upright Sleeper would serve the purpose? 
• Next I'd like to paint the posts so they don't standout due to the aluminium look. Not sure which paint to use with Ironbark sleepers.
• Any fillers to fill the gaps between the sleepers and posts for the sleepers to be held firmly in the posts?

Would appreciate suggestions and improvements on how to go about this plan or any other ideas on better ways of doing the frontyard

[Dave-1]

Good Evening @DC15 

Thats a nice garden area and raised edges. I was hesitant about cutting the concrete sleepers at first (thinking of the structual makeup of them) but as @JacobZ has mentioned them, I will loose my hesitancy )

If you look in your latest water bill (Sydney water) they actually have a diagram card in the envelope over the minimun spacing around the meter and tap. 150mm under the meter and I think it was 150mm either side of the feed in and then the feed to your house/unit. As long as its accesable there isnt an issue.

So you could have the meter within your garden bed

The only other thing is the section of garden bed that will be raised next to your driveway and the potential of the car door knocking it/blocking access. Only because it came up in another thread. I dont think your new garden bed will be too high to cause an issue but better to at least factor it in.

Dave