That's great the door is there, that made the project a whole lot easier.
There was 2 different layouts, you have the front dinette - rear gaucho one...same as mine. With that you also got the outside rear cargo door & the large front window/smaller closet area. BTW all of your windows (except the rear) are the same size & will interchange with each other.
The second layout has the rear dinette with a front L shaped seating area/bed. That has the smaller front window/larger closet and has no rear outside cargo door but there is typically a rear spare tire mount as well as rear overhead storage.
The rear bunk is difficult to operate, you need to get both of the swinging arms to move in unison to properly store it in the up position. It's so heavy & awkward to move that the only way I found to put in the "up" position was to lay on my back on the bed below then use my legs/feet to swing it into place. I'm not sure what the weight
limit design was on the bunk but I wouldn't trust it with much over 75 - 80 lbs. I left the bunk out when I redid ours as it is very heavy plus it covers the upper 4" of the rear side windows. The extra headroom w/o the bunk is nice too!
I've done a gut & rebuild on my amerigo
as well as Kai & Paul have on theirs. You may find it helpful to read thru the posts in the amerigo section, there's so few of these out there that you should be able to read thru most of them in a couple of sessions.