[P11GT]

MDF = medium density fibreboard, like frogg said, 3/4 inch or 18mm is best, then you need some self taping screws, 1.5 inch does fine, wood glue, silicone sealer, port, if required, and temrinal. You can fill the inside with what i call, wadding, especially in sealed boxes, this fools the sub making it think that the internal volume is larger than it is. And to finish the outside, you need some strong spray glue, contact adhesive and some backless accoustic carpet of your choice.

Get the spec, i'll have a go. Did i say i needed the sub displacement aswell???