board now fits Hammond 1455-N-1602 enclosure. Is 4 layer. actually it will fit in a L1602 (30mm high) but a bit tight in the vertical http://www.hammondmfg.com/pdf/1455N1602.pdf http://www.hammondmfg.com/pdf/1455L1602.pdf have put a cutout in the pcb for a little fan