Hey Doka,
I just reclassified ours. I sent lots of pics of the inside and outside, drawing attention to details on the outside which make it obvious it's a camper such as the windows, roof vents, tv aerial, lights etc. Apparently they won't give full reclassification (but instead send it back as 'panel van with windows') if it does not look like a campervan from the outside. Similarly, all internal requirements must be met.
ianc, pretty sure you won't have any problems! Looks great by the way. What are you doing about chassis flexing?
Ta,