Just started a Moon Patrol restore and looking to put it back to as close original as possible, the one I picked up was converted to a switcher and everything else was removed.
I have the power supply board and heat sink. The big transformer is the expensive part. Last one I saw on eBay went for $125 + $35 shipping. Lots of Moon Patrols run on switchers quite nicely. Moon Partol boardset were designed by IREM and do not suffer the same CMOS issues that the Williams classic boardsets do with switchers.