Swapping the motor, trans, t-case, rear end, and ecu aren't that difficult or expensive depending on where you get them, but to make it easy, get an engine wiring harness from a vr4. A lot of stuff is different besides being non-turbo, similar to the differences between '90 dsms and '91-94 dsms. Shift linkage and shifter are an example.
Go for it, but you're probably best getting a vr4 parts car to donate parts. Look for one with body damage or tons of rust. The interiors are identical besides the seats, steering wheel, door inserts, center console cover, and no boost gauge. It won't really be vr4 spec without 4WS...but none of us have that anyway. And the gsx has different sideskirts, front bumper, and wheels.
I like the GGSX because its rarer, came in different colors, can look more sleeper, and is lighter from the factory. A lot of them(if not all) did not have abs, and you don't have to deal with a bad 4WS removal.