I go on holiday for a week and this is what I come back to? My gosh.
MFR was actually one of the main inspirations behind this map. On the few weeks before I found out about jampacked, I was playing on a server which had a 'no fun no lag' attitude, such that the only farms you could use was a 3x3 treefarm and a 9x9 crop farm from MFR. When I then found out about the competition, my first thought was 'Screw these guys, I'm going to have a map with as many entities you can shove in it as possible!' Thus the map was born.
As for lockdown, I recently just heard of it, but considering what it does, I'll definitely add it to next version. I rarely want to add to the mod count, but this one makes too much sense.
Also, I have stated this before, on the top of the blocks are invisible blocks, so you can't use the tops, you have to use the sides.
EDIT:
Huh.