Heating enclosure questions

[TroyL]

I recently acquired a 48x30x13 snake cage. its 1/8" plastic material. I am planning on putting my Brazilian in it.. My question/issue is how do I get this thing up to 80° F. My house is usually set at about 67 in the cold months. I have several options for inside the box.. newspaper, aspen or even mulch.. Guessing for what I am doing newspaper would prolly be best option currently.. I also plan on putting damp aspen or much in a box in it to raise the humid to the 90-95$ point. Any suggestions would be great.. I do have a lighting bulb socket in the unit.. Was hoping to do a heat panel but not sure that is going to be the best option as I don't really know how they work.

Posted pictures to get an idea of what I am working with.

Thanks in advance

Troy