Hi Kurt,
sorry I only just saw your message. We've used the slid-a-van quite a few times now and we really enjoy using it. being able to stand up inside makes it so usable.
Having said that there are a couple of things I'd change
1) a better lifting mechanism. While Benjy's design is simple and mostly effective, it can be a bit fiddly getting the top to raise and lower without jamming on one of the corners and more often than not she needs a little encouragement to raise or lower straight. Now that's most probably down to my poor build accuracy, and as I mentioned in my build journal I made one panel that definitely wasn't as flat as it should have been. I do dream of being able to raise the top at the push of a button via some kind of electric winch mechanism.
2) Storage access. I would recommend making the seat cushions in two halves just to make it easier to access items that are stored under there (a future mod I'll probably do at some point if I refresh the interior).
Having said that, I would recommend this little camper project to anyone. We love or Slid-a-van