How to fix damaged timber legs of Santa's throne?

[ilox]

In 2011, I built this lovely Santa throne from plans bought from the USA. The majority of the timber came from Bunnings Parafield. Since then it has stood me in good stead over successive Christmas events (this is my 21st year as a Santa and yes, I have been Santa for many of Bunnings SA Stores). 

The throne ready for use.

Last year I found that white ants had worked their way up a crack in my shed floor and attacked the nearest leg they could find. I killed them off with poison spray but now I need to do a makeover to clean up the mess and get it ready for use over the next few weeks.

the front right leg  the front right leg the front right leg the front right leg

The first step - I think - is to take a 45-degree cut to remove as much as I can of the damage at the same time retaining maximum strength because I have some pretty hefty folks sitting on it at times.  
It has been suggested that I then putty it to fill any remaining holes and possibly put a curve on the edge to make it look better.
Then it is time for the Paint shop to get Brunswick Green enamel to put 2 coats on the whole surface area. I will have to cut back the surface with my sander, advice on grit please.

Your suggestions are welcomed.

[ilox]

Another way to hide the damaged timber and repairs might be to put disks like this chair at the front. The strain would be too much to think of having functional wheels, I have a trolley for moving the chair. 
I really do like the embellishments on this chair but Bunnings don't do them anymore, do they?This is what Santa Bob McMasters' did with the same plans.

[ilox]

Oh, thank you for the info, I didn't realise that was how it worked. Yep, I can see why it was recommended.

I watched the video and the second one suggested that I don't use it for "structural or load-bearing timbers." 
That's why I was thinking of Eric's suggestion to replace the damaged area with a block of fresh timber. About 100 x 100 x 42 would cover the damage if I can find some scrap to that dimension. The leg is 185 x 42.

[MitchellMc]

Hi @ilox,

I haven't seen those fancy embellishments for many years, and I am not aware of any of our suppliers producing them. 

I'd recommend cutting off the damaged leg timber and jointing on a new section.

Mitchell