I am currently repairing two Oltronix B703DT and wanted to replace the analog voltmeters on those with digital ones (there is a variant of this psu with them), but i could not find voltmeters that are small enough to fit the 42x12mm holes of the analog ones (the original digitals have the same size, +/- 1mm). Next problem: Since there is literally no free space in this PSUs, i can't build a seperate power supply for those so they have to be driven from the same psu.
Btw: Don't ever plan on buying one of this things broken as a "casual" repair job, they are among the most nasty designs i have ever encountered: Ridiculously short cables, unlabeled identical connectors, everything is soldered and there is no room at all. Oh, did i mention that the only thing holding it together is the aluminum top plate? So if you want to remove it (which you have in order to open it), the only thing holding it together is the pcb (which is getting twisted btw). So if you want a free demo of what becoming mentally insane looks like, go for it.