Being the math person and huge lover of numbers that I am and R3 being the "miniature" rule, I decided to collect some stats for the R3 levels
See attached file
In summary, for NL everyone made a 160 x 100 level except for Kingshadow, whose level is instead 128 x 90. For Lix, geoo's is 192 x 192, while Simon's is 320 x 200, which is the maximum allowed in either direction for that engine, and the dimensions are doubled that of NL's because of high-res.
In terms of lemming count, geoo, Niesch, and myself are all tied with 9, the maximum allowed for this ruleset, though Niesch's is an 8-lemming level where you can get a 9th with the cloner skill
Finally, in terms of the maximum amount of skills you can assign/use, Armani, Icho, and Niesch are all tied with 9, though once again in Niesch's case there are 8 skills you can assign + 1 pickup
Not shown in the table, but out of all the R3's, my R3 is also the shortest in terms of solve time, where mine is pretty much the only one that can be solved in under 30 seconds (about 28 seconds or so), with a close second by Niesch, which, even with the correct RR fiddling to do the building ASAP, would still finish a little over 30 seconds.