I can see Squires Tools possibly making a pitch for the remains of Eileen's - they seem to be on the lookout for ways to expand their empire. Just look at how well their takeover of South Eastern Finecast went.
Coopercraft wagons were probably the only usable part left. There has been some doubt expressed elsewhere about Slaters reclaiming the tooling for their coaching stock (GWR Toplights, basically). Last I heard was that some of the tools/moulds might be scrap because they hadn't been properly stored or otherwise looked after.
If you want SSM to expand, then you need to have a serious discussion with @Weshtyas to what is practical. He's not been on the Forum for a while, so I'm guessing he has other priorities which don't necessarily involve new kit design.