Just picked up a 1993 SVT II (non pro) and thinking about installing it in a rack for protection. Three questions; -Number of spaces? Should I get a 4 unit or 6 unit size? 4 seems to tight for the face flange (7" exactly without feet installed) but 6 would be to big. I can't find a 5. -Fans? Given the heat this amp produces would it be wise to install some cooling fans in the rack with amp? If so recommended manufactures/suppliers please. This head runs a minimum of two+ hour light load a day, 5 to 6 days a week. -Wood, vinyl and metal type rack/cases vs molded plastic versions? Again given the heat emitted from this head is one type preferable over the other? Recommended manufactures? Thanks for your time.