To get it up an running, you can get a lower line strainer (with the flat plate face and simple block letter stamped "ROGERS" string plate mounted higher up on the strainer body) as it uses the same shell mount holes. I have one that will likely become available soon, but I am in the middle of sorting out my Rogers snares now, so nothing is going until I'm all set myself! :)
As to the snare butt, you have to use the correct one. The hole spacing is close (narow) and I don't know of any others that have similar hole spacing. I also have one of these (significant pitting, but fine otherwise) that may be available as well.
If you don't find another solution, try PMing me in a couple weeks and I'll see where I'm at.
I will also have a PowerTone shell (COB) and some lugs too most likely- I'm making one 'keeper' out of two that are both suffering from a few issues each...