If you are near an ACE hardware I would suggest going there with some of the screws you want to mount the MB with. Hopefully they will have a big selection of bolts and anchors.
For mounting the MB, I used some round anchors with three prongs in them. They have a threaded barrel to accept a bolt, you drill a hole in the ply, hammer in the anchors and thread in a bolt, using some plastic tubes spacers as standoffs.
You can search the forums for shock mounting the drives, there are some exotic ideas (I molded a silicone HDD mount, never used it cause it stank - did not cure properly) and some basic ones (pad it with foam).