Morning MarkC and anyone who wants to add some info,
As mentioned in the original PM about the hard points, I'm building Excel 2000 spreadsheet modules, very basic and clunky, to double check my manual number crunching. So far I've created a Hull module - SM: P Steps 1 to 5, revamping the Drive module - SM: P Steps 6 - 7, Weapons - SM: P Steps 4, 8 - 9, and payload pallets - SM: P Steps 4, 9 - 10.
Each module is built as a stand alone system with the following basic parameters: Civilization [ISC, Emp], TL [14 - 29], Speed, Acceleration, Vehicle Type [SM: P Step 1], Mass/Volume [SM: P Step 2], and Hull [SM: P Step 3]. Inside of each module I've added the ability to change the TL of some of the components, for example in the Hull module you can adjust the TL of the strong and hard points to be different from the hull TL.
Getting back to Reactionless drives TL question is based would a formula something like this be correct in the table:
Parameters: TL = 23 and Civilization = Emp
Reactionless Drives Chart Mass
Standard TL 23 Mass = 5, Emp TL 23 Mass = 3
if(Cellxx="Emp",3,5)
Hopefully, the above makes sense.