Hi Cruiser91,
Would you please clarify how you solved those four issues ?
Cheers
Rob
Heres a starter for dust proofing that works on my camper, though there are many variations its all the same concept and I can't take credit for the idea, all info is on myswag, you just have to find it.
http://www.myswag.org/index.php?topic=42387.msg705072#msg705072Remedy for condensation under mattresses is to get air flow under mattresses. You can get a product specifically for this problem at Clark Rubber.
Keeping bedding dry when canvas is wet: I work on this myself and came up with something that works 100%. Please search through my post to find it, it also has pictures.
Blocking corner holes: Simpler than you think. Again, Clark Rubber stock thick foam, purchase enough to cut small blocks to stick up there when camped, works great and purchase enough to have a few spares.
After seeing these remedies, you may have better idea's, which is no problem at all, please don't forget to share your experiences, its what this forum is about.