I like the slant back design..Better for eye appeal...at least for me.Also allows for 1 sheet of plywood for entire roof.Rear door design,2 doors, 1 for trailer,1 for small storage/galley..I might inset the doors slightly..the rear side's would have a FIN ..look to them..It will have 3 windows,front & each side..+ sun roof/ exhaust fan.