My first teardrop attempt

My plan is to have a teardrop base 5X7 & walls 4X8 all done in exterior ply
3/4" walls
1/2" floor & shelves
1/8" ceiling with 1"X2" beams spaced at every 8"
No insulation & install a hatch
My partner is going to build a galvanised trailer for me
When I start I will try to post some pictures
I would like it as easy as possible to build & be lightweight
If anyone has different ideas of how I can improve it please let me know
3/4" walls
1/2" floor & shelves
1/8" ceiling with 1"X2" beams spaced at every 8"
No insulation & install a hatch
My partner is going to build a galvanised trailer for me

When I start I will try to post some pictures
I would like it as easy as possible to build & be lightweight
If anyone has different ideas of how I can improve it please let me know