Most of the stuff mentioned may be possible if you find a way to do it without making the game crash. That is the trick, and where sins is unforgiving in some aspects. Many of the suggestions that were made for SoA 2 mod were tried,... and they failed miserably, because of the sins hard code. An example is the cloaking ability. Which sins has sort of a cloaking ability in itself. The Vasari Phase cloak, and Phase out hull ability. We just tried to modify it to where the ships, icons, and hud were all invisible. That is impossible to do, because this is hard coded into sins itself. We can however simulate a cloak to where the ships cant fire on one another, but you still know the ship is present. Many other things were tried like tractor beams, Borg assimilation etc. etc. You can "simulate" many things, but it is not the same as a full blown ability from scratch.
The only way you are going to find out if you can similate tech 1, tech 2, Kinetic, EM, Explosive, and heat in Weapon damage, Shields, and Armor is to try it. If it fails at least you know you tried. ECM/ECCM to-hit buff, and debuff abilitys can be simulated easily. So can radar enhancers, jammers. Afterburners, etc. Even warp scrammers can be simulated. The things you cant simulate are weapon/ammo changes on the fly. If a ship has one damage type it always has that damage type. If a Caracal is equiped with tech 2 kinetics it will always have tech 2 kinetics.
Yes you can make a ship upgrade with a new physical model to represent that upgrade. The ship entitys do support this. We tried it in SoA 2 with the Excelsior, and Lakota refit. The only part we couldnt get right was the old excelsior model dissapearing after the upgrade was complete. It would spawn a new ship on top of the old. We tried to have it as a researchable ability not as research itself then all models upgraded like the hangar defense, turrets, and starbases. So that idea was scrapped for now. Again the only way you will know for sure is to try it.
Yes CCP is very protective of its IP. Nuff said. If you can pull it off with their approval then good on ya. I am not trying to discorage you here. I am all for an eve mod. However i would hate to see you make good progress then get cease, and desist letters. Check with CCP about this before you dive into it. They are pretty cool about it, as the HW2 eve mod shows.