advanced enclosure building

hey guys just wondering about for enclosures what materials are best for the walls that will allow the head pads to effectively heat the interior? I would not think plywood or the harder version of plywood (drawing a blank) would allow the heat to pass into the enclosure?


Two just caulk the seams and lay substrate or should i finish the interior wood?

Door designs I have a plan to put the whole front half on a hinge with a plate of glass in the wood, but i would rather insert two sliding pieces not quite sure how that would be done advice?

Gonna decide on materials tommrow and hopefully have everything but the door design completed. Gonna look really pretty when done!