@XMDrifter, the fenders are actually wide enough. Comparing with mini-z AWD offset, it already fits a +2 wide just perfectly tucked, +2.5 makes it flush. It's the same as my widebody altezza.
As promised, here's an update (though small).
I remember seeing on another modelling forum that someone was using lego to keep things in place, like a jig. So I went ahead and did that myself. Just a tad of plastic cement secured the body onto the lego.
JGTC R34 Jig by
kdeeela, on Flickr
Other than that, all I really did was make a front splitter and secure it onto the jig and body.
JGTC R34 Splitter 1 by
kdeeela, on Flickr
JGTC R34 Splitter 2 by
kdeeela, on Flickr
JGTC R34 Splitter 3 by
kdeeela, on Flickr
Also started on a second R34 body, making another ER34 (since I literally trashed the last one and gave up entirely). I guess you can already see that in the first photo, but I'll get more in depth when more work arises.
C&C Welcome!