Hi,
Any common simple +/-15v psu such as JLM ACDC or the like will work.
Have you asked the seller about wiring and metering documentation ? he might have had it when he bought the boards to Wayne, otherwise, It would be worth a try to contact Wayne or Roger, as those boards where provided by them when Roger shared this project . Even if it became a commercial product, many of these DIY projects were finished after it did , and the gentlemen didn't stop supporting them totally.
And sharing a switch wiring diagram or a FPD file is not like sharing a complete schematic.
And anyway, no one will bite you. Even if there is no support any more.
Just my two cents.
@ Plumsolly : PM'd you.
Laurent.