I'm in a situation not dis-similar to yours. I came to back Traveller ship design in Mongoose 1st Edition after along absence from the original books to see how the new rules scrubbed up and how ships looked compared to what was a very long time ago in gaming terms. (let's not try to compare something like D&D since those timesGhengisRexx said:Thanks for all the replies. Now I have to get my head around whether I want to just take the existing rules and change them so they make some sense, or play MT 1.
Seems like my choice is either,
A. Put up with being annoyed by a design system where every ship has max M Drive, and Max armor. And none of the cannon ship designs are usable anymore. To me, this is a terrible design choice. I don't mind M9, but to make M9 and max armor standard is just......
Or B, I can redo some design math to make sense (not so big a deal) design all new ships (a big deal) , and ignore all the shiny new products that will be coming out (bad for supporting the good people making the game. Meh.

From my personal perspective given the original rules were a can of worms that were pointless in execution because the ships when built did not match by the rules with their intended function, I'm more than happy to take the original concepts (which for the most part were good) and rework these in design rules that... work. Things haven't really or won't change that much. Cruisers are still cruisers etc etc.