I really need to post my build up, but as for the lock you can fit a snap on tubular lock assembly with little filing on the 5-drawer. You don't even have to modify the latch just bolt in to the lock assembly.
Did you leave all the bolts loose til the end? I had issues with mine when I was tightening all the bolts as I went. I loosened everything up and it went together much easier and I was able to square/level everything up.
If you're sure that there's still some air in the abs I've had some luck with going out to a dirt pit or some place where you can actually get the abs to actuate a few times then bleed again.
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