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Go for it!!

don't confuse appearance with actual construction. What looks like a channel is, in the high priced products, simply one attachment of a baffle. I am having trouble visualizing sewing these tile...

pineapplenewton... what you are essentially talking about there is a sewn through design. I would expect you to find the spaces between the "tiles" would be fast avenues for wind to enter and heat...

http://www.montbell.us/products/techinfo/techsys/material/material21.html

it's got pictures of the before and after. I strongly suspect the heat plays as much a part as the roller pressure if not...

Pong... I don't want to rain on you parade... but be very careful of the ripstop from walmart for down projects. Particularly with <800 down. Lower down quality includes more quill feathers. ...