na wanting to swap motors
 

is it worth time and money to do twin turbo swap? or should i build the hell out of turbo II?

No and yes.

The latter would be more satisfying.

the twin turbo setup used on the FD was poorly designed. or so i've heard. never dealt with it. its almost too much work to try and get it to work right.
way better to take taht money and build a monster S5 turbo 2.

i was considering the same thing but ended up doing the TII swap