Update:
Played on Thursday night with my group. I laid out the options: 1. haul as much Endo Steel back on their dropships as they can cram also with all their other spoils, 2. check inventory of Clan Battlemechs to see what is available to take, 3. wait the time for the new skeleton to be forged with the probability of facing a fight from several Clans, or 4. some sort of combo of the options.
The group decided on cram as much as possible material onto the dropships (they somehow captured a Overlord C in a lightning strike to the airfield which went WAY better than it should have) and perused through the battlemechs on hand. As this was one of the main area of equipment shipping to the IS, they found a couple of PHX-3K's, -1K's, -1's, and (with the luckiest roll I have ever seen in any system) a PXH-1b "Special".
Needless to say, the old torn up Pixie was left behind. They launched and made the rendezvous with their Jumpships for the long trek home.
The player in question is planning to replace all the IS weapons with Clan weapons with the exception of the ERPPC which is being replaced with another ER Large laser. (the player got into Battletech via the HBS game and showed me his build for the PXH-1b "Special" in game and wanted to do something similar.)
I think that did very well for themselves in the campaign. Can't wait to see what they want to do next.