Questions:
Do you have to use a generated image or can you upload your own?
If you plan on submitting a large sized build with a file size of over X.gb will the whole duplicator mover thing be ignored so the server won't lag or will you have to submitt the build in parts?
Will the build require a sort of spawn plate for the mover?
There will be generated images but I think I'll allow submission of your own (although you won't be able to do this from ingame).
The system is more for props and small parts not an entire build so there wouldn't ever be a case where a submission is that big. There will be dimension restrictions and brick count restrictions and such.
The prop temp brick will basically be a custom brick which is essentially a large plate with a border, you'll need to build on one of these in order to submit your prop too.