Here's the enclosure. It's 4.4 cu.ft. NET and matches your given dimensions exactly. The angle that the top, bottom and back need to be cut to is approximately 17.5 deg. If you have a table saw you should have a pretty easy time of getting really close. If you're using a circular saw to make your cuts I suggest getting a tool like THIS ONE and it should make it easy enough to get really close as well. Otherwise you may have to just practice on some scrap pieces until you get it close enough. Also, if you're using a circular saw make absolutely certain you're using a saw guide with cuts this long, especially when cutting angles. It's tricky enough to cut straight lines with a circular saw with a standard cut but go to cut angles and it's almost impossible to make a good cut without a guide. If you don't have one I can point you to a link that explains how to make your own very easily that cost next to nothing. Onto the enclosure pics. I can't wait to see how it turns out and what you think of the XCON's in the sealed enclosure. Let me know if you need anything else.