I have a Maestro subwoofer that is in need of a baseplate.  The current one was damaged in a move.  Mark at Meniscusaudio says if he has the dimensions they could likely manufacture one.  Prior to going that route I was wondering:
 
1.  Are, or were, the baseplates commodity items that might be still available from an existing source such that I may be able to purchase one from their current inventory?
3.  If the baseplate is a custom product, is it made of MDF, or from some special material?
 
Any suggestions would be greatly appreciated.