We are on the same page, I'm saying make it less complicated; ships are gonna have all the packages included at one price. The J Drive thing is only an example, not that it would determine the costs, only that say if you had a J3 drive, that a model 3 computer is included in the cost, then use the computer table for upgrades. The idea is to streamline the whole process, upgrades are cool, though I don't see people do it over getting a new ship, normally what they do.
Everything is now, a lot of what is done is only for a "building game" which doesn't always seem used in play. Plus the costs of computers, computer brains aren't in alignment for different sections. On top of that, it is difficult to wrap ones mind around that why wouldn't a tens of megacredit ship have everything top of the line for it's TL. This is one of the statements that revived the line of thinking:
.... and the installation of a fuel purification plant (TL=11).
From the Solar Queen thread, though I did do some simplification of the rules in Kosmic too. Part of the effort is to retain backwards compatibility.