Building a power supply for ACP+

Dear fellow DIYers!
I have built an ACA into an old Mac G5 (cheap aluminium) and an ACP+ with it. Now I borrowed a BA3 with "real power supply" and find it such a great improvement that I was wondering how I could build a power supply with toroidal transformer myself (for ACP+). Can somebody help me out with a BOM or guide or so? I'm quite new to building. Also I was wondering whether it might have to do more with the BA3 Vs. ACP+ or rather power supply? Thanks in advance for all your help!
Kind regards,
Johannes