A buddy of mine bought my last genI and did several versions of a chop. Version one sounds like what you want to do (he left it as a trayback) and he left some room behind the front seats. Version two is more like a single cab pickup.

Here's his build thread, not updated for a while... this page is where the pics start working:
http://www.4x4wire.com/forums/showf...;amp;page=0&fpart=4&vc=1

Phil

1991 HZJ77, 1999 KZJ90, 1999 UZJ100, 1992 M101CDN2
https://www.thegearheadproject.com/category/jdm-journeys/