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Plastic will probably be a little more stable, but I'm not sure how well the paint jobs will hold up.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/748690/9786473.page http://www.dakkadakka.com/dakkaforum/posts/preList/748690/9786473.page GMT
Assuming you made it water tight the biggest problem you might have is heat. I have no idea what the weather is like in Canada, but your plastic box will work like a solar oven. Heat will go in but won't escape quickly. Whether or not it poses a problem depends on how hot it gets. Here in Australia it's not uncommon to hear about models left in cars warping during summer.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/748690/9786482.page http://www.dakkadakka.com/dakkaforum/posts/preList/748690/9786482.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/748690/9786615.page http://www.dakkadakka.com/dakkaforum/posts/preList/748690/9786615.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/748690/9786681.page http://www.dakkadakka.com/dakkaforum/posts/preList/748690/9786681.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/748690/9787005.page http://www.dakkadakka.com/dakkaforum/posts/preList/748690/9787005.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/748690/9787472.page http://www.dakkadakka.com/dakkaforum/posts/preList/748690/9787472.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/748690/9787623.page http://www.dakkadakka.com/dakkaforum/posts/preList/748690/9787623.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/748690/9787648.page http://www.dakkadakka.com/dakkaforum/posts/preList/748690/9787648.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/748690/9787650.page http://www.dakkadakka.com/dakkaforum/posts/preList/748690/9787650.page GMT