Greenhouse: leaky greenhouse, 0 by snoggle

snoggle wrote:
My husband and his godfather built a greenhouse for me out of parts from an old (1920's) commercial greenhouse. I haven't really had a chance to start using it yet, but am working on getting is set up. The problem is that it is very "leaky" around the four vents (they were doors in the original GH). Because they are from old wood they are somewhat warped and uneven and there are gaps between the wood of the vents and the wood of the greenhouse that they rest on.

I've attached a picture so you can get an idea of what it looks like. I'd like to figure out what I can put on the vents to kinda "fill in" the gaps. I thought about trying some foam weatherstripping tape. I'm kinda not thrilled with how the foam tape will look, plus I'm not sure it will be thick enough in some spots. Does anyone have any other ideas?