OK, I understand what tramming is (I think), but have questions: with all those endstops, X is already parallel to the surface, right? If I understand that correctly, my tramming should be only checking bit is perpendicular to the table, right? And then adjust the router itself? Sitting of the router in the holder and such… right?
But considering I’m doing this to flatten my table, it kinda sucks coz it will be perpendicular in one place, but not the other, sooooo… 
Yes it has to be perpendicular in both x and y - otherwise you’ll get ridges as you try and tram the spoil board. Using a smaller bit is good advice too.
Oh maaaan, final assembly is not going as I’d like to… one of the struts is too high and do not get into “lanes” on the brace. I decided to still go on and install it and replace at later date, however those screws are killing me. So small space and difficult access - argh! I’ll ask my son tomorrow, maybe his little fingers will help 
Or maybe there is something I don’t know? Like special tool to get those in place?
Also I don’t know how did I end up with wrong cut strut?
Oh, I can just cut it to proper width on the table saw, can’t I?
Not really since the holes are evenly spaced. 
LR4 has captured nuts now. 
I’ll take a look, coz I could cut 1mm from the top and 1mm from the bottom if needed? I’ll check tomorrow while in shop.
This decision has already been made - I will build LR4 after I finish v3
Oh, top and bottom should not matter. Sorry, thought the sides.