Interesting design. Thank you for these. I hadn't seen this particular camper before. I do like that design, and you are right, they don't seem unbalanced.I think the size looks good. These have cabins perhaps larger than your plan and they are very balanced IMO.
I think these are about 131" wheelbase
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Looks like they are a bit longer and wider than my goal, but with the longer wheelbase, they don't look bad at all.
I might be close to those proportions. (except for the height)
Looks like they even managed to fit a small bathroom in there.
Thank you again for the images.