I have Rob's videos and a few others bookmarked, very helpful when I was starting out. Now it's just practice as with each new set of joints the fit cleaner and tighter, no gaps etc..
Very nice work I see in your picture and some nice amps you got there. It's funny, I just mentioned making a small wood chassis for some transformers I have laying around to use with moving coil carts. It looks as if you may have the same RCA MI-12399 transformers in your setup. They test well on the bench, better than other transformers I have purchased for a premium. What do you think of them? I see you have another SUT setup with different iron. Which do you like better? Obviously from the picture they are connected to different tonearms and maybe different carts, hard to say if there is a sound difference if it's the transformers or the different arms/carts.