Sorry for the delay in replying, the system doesn't email me when there is a message here.
a) Omnitech is somewhat bugged when you add armor in chunks larger than the standard (I don't recall the number off the top of my head). When you repair it gives the correct total hit points, it just allocates them in weird places. The options are to go back to the original armor numbers (which means Ferro and clan-Ferro give no bonus armor per slot) or deal with the weird distribution. As best I can tell this from the core game files and out of my control.
In addition to making Ferro useful, using the larger armor values makes mech much more durable and also allowing for a larger spread in weapon damages.
b) I do not think 2.40 has all the mechs or weapons that I used in the campaign. Thus I don't thing this campaign will work with that version. Feel free to try.
The one other area that may cause compatibility issues is the pilot files, you may need to edit them to make it compatible with the older version. Id just look at the pilot files from 2.40 and delete everything in mine that doesn't correspond to the 2.40 version.
Best of luck!
Drewbs
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