A lot of these are awesome and would benefit with some killboxes alone and the implimentation of water.
but with the water i do worry for the framerate

It's sort of on the wishlist for my other arena pack, to update and include some of these; the biggest trouble, really, is that levels with height/jumping are pretty much restricted to rabbit enemies only (unless I made some tweaks to rats; they wouldn't lose any meaningful special characteristics by having their species setting changed). So as neat as the level design may be, it's pretty restrictive in terms of what I can do with them, for the moment.

A lot of these maps are flat out excellent, and a lot of fun to play. With a little graphical updating to bring them up to par with the base game, these would make excellent additions to the arena mode. Any chance you might do that?