Not a bad layout, but I’d changhe a few things, for one the table should be convertible to a double bed so it at least sleeps as many people as it can carry.
I do like the idea of a shower though, IMO it’s more usefull than a bed. Go for adaytrip somewhere, ride, shower, get changed, go to the pub, eat, etc, drive home clean. If you’re sleeping somewhere and biking then you’re going to need a shower as well. And if you’re staying on campsites then for a few quid more you could stay in a hostle and have a propper bed/shower! Quite tempted by some sort of landrover style roof tent on a van, then the ‘downstairs’ can just be kitchen/shower/garrage.
And the finish is completely tasteless. Not just bad, but completely absent of anything at all! Mmmmmmmmm grey lino and formica everywhere.