I've thought about it a long time, there are two directions I can go with DD. One is to continue to do the D&D with numbers filed off thing. I don't think that benefits anyone--why not play D&D and rename things?
The other is to go a bit sideways. Keeping it old school, but by way of MSH, Talislanta, and Tunnels & Trolls. Twisting these ideas together gets this character sheet. It needs some work, some vetting, and some hammering.
I'd like to simplify it more. The goal is to combine Race/Species stat profiles (Body/Mind/Senses) with Profession Stats (Fisticuffs, Arms, Knowledge, etc.) That creates a basic profile--two insectoid soldiers will look the same at that point. Plus be easy to put together. A few tweaks (aspects that describe the species variations in short) and a bit of personal tailoring, and tada! Complete character sans gear in a matter of minutes.
However, my goal is to make the game as basic pulp SF/space opera as possible. With a retro 50's feel, bubble space helmets, and rayguns--but still keep a solid grounding of science within a certain framework. After all really advanced science goes into those suits with their bubble helmets, and beam guns with their fins.
The mechanic will be 2d10+Stat+Misc Mods+Gear vs D# (Possibly modified by opposing Stat+Mods+Gear) The average difficulty is 10 with the D# modified to determine difficulty. The "misc mods" are never things like weather or positioning, just stuff like that guy is a super fast reptiloid so he has "Speed +2 aspect" as above in creating race stat lines. Inherant items to a monster or npc.
Example roll: Insectoid Soldier shoots reptiloid enemy who is as above fast.
The soldier takes Arms (2) + Laser Rifle (+2)+2d10 vs D#10+Reptiloids Dodge (2) +Speedy (+2) and he has a shield (+1) he whips that shield up and move to deflect the shot. Soldier buzzing angrily shoots get 13 vs his 15. It is with five of the D# required so she clips him (partial success) the edge of the shield catches the beam but the rifle still slashes past and singes him for half damage.
If she had got an 16 she'd have a Solid Success and do full damage for that rifle. If she'd had Arms (3) and rolled a 20 (total 25) she'd perform a critical on him (10 over the TN) She'd kill him (or maim him, her choice. ) Outright.