I recently acquired an Amiga 4000 that had it's motherboard recapped by AmigaKit a few years ago. Although it worked, the horrible workmanship of the recap was so severe I just couldn't stomach leaving it be... pads torn off the board, scorch marks, replacement caps soldered so poorly the slightest pressure knocked them right off, and in the cases where the pads were gone, the caps were glued into place with glue oozing through vias into the backside.
I decided to order one of the new replica 4000 motherboards, and my initial plan was to transplant the custom chips onto it and populate the rest of the components with all new parts. But since I had to order the nearly impossible to find DB-23 sockets from Individual Computers anyway, I went ahead and ordered a completely new set of custom chips (minus the CIAs) too.
So now I have a pretty much brand new Amiga 4000 motherboard. I reused the video DAC, CIAs, and RTC chip/crystal, but otherwise everything else is new. Everything works perfectly, and I think it looks really cool too!
The old custom chips are now spares-which is nice considering I have several other Amigas that use the same custom chips.
My next project will be to build another A3660, this time in red to match the new 4000 motherboard.
UPDATE 6-23-2019: As promised built an A3660 in red to match the motherboard. It's not the best picture but here it is installed in the 4000 with a Rev 5 68060 and working great.