College Student & Full Time"RV" Living

I'll restate... My goal is to design and build a vehicle that by itself can be used to transport "cargo" but with the simple swapping of items inside, can be used to live in.

So if this is the case, your on the wrong forum. This forum has to do with RVing, and the only RV you haul cargo in is called a toy hauler, which you obviously are not interested in. You will also note that there is not a forum on RV.net titled "Box Van Conversions". Besides on page ten you stated that you were out of here. Since you already have an answer for every piece of advice given in 13 pages, perhaps you should find some forum where you can get the answers you want to hear.