Canvas tents...ahh, the memories!
I did a lot of buckskinning reenactment stuff as a teenager, and spent a lot of time in canvas tents/lean-to's/teepees.
And the US Army was still using canvas tents when I got out in '99...for a good reason. Yep, they're heavy. But they are durable, and when maintained well very, very water and wind proof.
Love the idea of bringing a hammock into one...very cool!