I'ver converted several planes to taildragger. Last one was a Hobbistar 60. Because the fueselage was fully liteply, I simply sawed out the main gear mounting block and moved it up against the leading edge fuselage former.

I'm currently converting a WM Super Stunt 60 to tail dragger. This one required new reinforment plates at the new gear mounting location because the liteply fuselage has many many lightening holes on it resembling a stick-built.

I've found that the conversion can be worked to affect CG balance to your favor. If you want a little more nose heavy, use strong main gears and bigger wheels, while keeping the tailwheel light by using a Klett assembly. OTOH, if you need to put weight in the back, stay lightweight on the main gear and install a beefy tailwheel (e.g. Ohio Superstar, etc.).