As previously mentioned, the plans neglect to instruct you to rivet the bellcrank ribs to the forward bulkhead. I didn't realize this until after the bottom skins were on the bellcrank ribs. Too bad, because it would have been easy to do prior to then. I was able to squeeze the middle rivet and buck the top rivet. But the bottom rivet would require a double offset set which is akin to taking your life in your hands (see next paragraph). So I used an LP4-3 on the left side. Problem solved.
This is what happens when you use a double offset set in an awkward position. I tried this on the right side (the view is looking forward from the right aft). This rivet will need to be removed and replaced with an LP4-3.
Here's what that looks like after removal. Yuck. I had to get a 12" #52 bit to use in conjunction with my 12" #40 and #30 bits. You can see I wasn't centered on the manufactured head, but I didn't do much damage to the bulkhead hole as I went very shallow into the head.
For perspective, the rivet of interest is circled in red below.
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