Well you probably found in your search that an l28et is an extemely daunting task that for the most part is pretty much undocumented. In fact I may be one of 2 or 3 that has swapped one into an s30 in all North America, maybe the world. This is mainly due to the extreme knowledge of fabrication required.
I swapped in an l28et in a few hours, but I am considered somewhat a scientist in this community.
You may want to try something simpler and cheaper for a first swap like a 13b rotatary, 2JZ, VG30dett, or if you're really on a budget, you might settle for an RB26, but be sure to swap in the full awd drivetrain to keep things simple.
Hope this helps