things i would
fix about delta siege dry :
1) heightmap balancing. there are a lot of spots on this map where ability to use the cliffs is compromised by inequality... of instance, east side, if you start on the ridge, you can build a lab down near the next metal spot right off the bat and claim 4 mexes, wheras the opposing side can only claim 2. if you start to the north in the basin on the west, you can build a mex up onto the cliff, wheras the opposing side cannot. the map is riddled with strange little "features" like this, which although are not immediately obvious, can end up making a big difference in the long run.
2) metal map balancing. some of the starts have metal spots that are very close together, some have ones that are very far apart. again, a mirroring or at least a calculated placement of spots in the starts in order to make it even between the two ends of the map would be a big improvement.
3) heightmap correction : moving across the dip in the north middle of the map with vehicles in BA has always been spotty, it's hard to tell exactly where vehicles can and cannot go. normalizing these slopes would be good. also, throughout the map, there are lumps and bumps indicated by strata lines... and there are zones with strata lines that don't actually have any bumps. i say smooth the shit out of any existing bumps as they serve only to confuse and muddy the gameplay (such as the northeast start) as well as to normalize cliff steepness so that building up or down a cliff does not entail any nasty surprises.
so what i would suggest... remake the heightmap completely but base it on the concept of DsD; if you can overcome all of the strange annoying little elements of dsd that i've listed, then i think you might have a winner.
incidentally, im not a big fan of typemaps... sometimes i like them, but in dsd, i don't really agree with how they are used.
*edit* also : im somewhat in agreement with the "we have enough dsds" sentiment... not that i dont support the idea of a remake or a fix, im going to go with behe and artturi and others and say you are capable of much, much more... i've seen it, i like your other concepts and maps... if you have delta sieges on the brain, maybe do a "dsd with a twist"... nuclear winter, kappa basin, those maps are dsd-like in their dimensions and makeup of elements (raised starts, ridges on a side), but even with what some would consider minor changes in the heightmap, you end up with a map that plays a lot differently.
people expect a lot from you because we've seen your other work

you're always going to get shit from people if you don't put forth what they feel is your very best work
anyways for my money it looks fun and playable; nice texture fo'shizzle