Thread: Thoughts/knowledge sought please

At the ripe old age of 60 with chronic fatigue and needing 2 knee replacements time is not on my side.
I would like to build a custom rifle that will see me out and ised only by me.
Have a couple of 308 rifles that mayes/ young adults use.
Thinking 243 as most of my deer shooting is under 250 yards bit I might shoot a fallow a bit further.
Prerequisites and non negotiable are
Stainless barrel ceracoted,carbon stock and detachable mag.
Have tikkas and dont want another.
Was thinking true flight barre so there also l as dont want to deal with hardys.
There goes the option of a hitech stock as well.
Circa 4 to 5 k and expection half moa at 100.