Here are some parts I have made in converting my large kossel all-metal delta https://www.thingiverse.com/thing:1776462 to enclosed with a watercooled hotend.
More detail here http://forums.reprap.org/read.php?178,702599,page=8
I have included the panels to be placed around the base of the machine as shown to insulate the base against the the side panels. They are large so consider cutting them in two and printing them, they work fine cut in two pieces, or you could bond them back together. The XZ panel fits my chamber heater with a smaller piece to go under it to seal it up, but you could use any of the other (XY, YZ) panels for your build.