Kef PSW 2000 rebuild

[WAFOE]

A month ago I bought a broken Kef PSW 2000 (driver and amplifier). Seller said power supply was missing. Well, the only thing that was missing was the connection port. So I rebuilt that, and now it's working fine.

Problem is, there's no resonance box. So I have to rebuild that.
The Kef PSW 2000 is a fairly small subwoofer, so this really has to be precise.
I already found out the wood they're using is MDF that's 14 mm thick.
But where do I get all the isolation? And do any of you have tips for building the box? Things I need to think of building it?

Thanks!

 

[WAFOE]

Now, 3 months later, I finally finished building the box. I made it in 2 weeks, with a lot of waiting it to dry and stuff.. But it's finally done now. Just to let you guys know!