Not an offshoot. Maybe you are not aware of it, but Monochrome Plastic Models from Japan has been creating excellent moulds for a while, and some of the most famed Trumpeter kits trace their origins to Monochrome.
For example, the best 1/72 Trumpeter kit yet, the Westland Wyvern, is from Monochrome origin. The 1/48 Wyvern is not, and you can see the quality differences between both, just opening the box.
Another Monochrome kits in the Trumpeter range are the 1/35 Sturer Emil, and the 1/144 Sabre. And there are more I can't remember now.
Monochrome has been previously working with Platz, Tristar and Sweet, and it is said that there are some ex-Tamiya employees in the team, but I can assure that. I think the people at Freightdog Models in UK have in the past some realtionship with Monochrome - Maybe they can help.
It's nice to see Monochrome mencioned in the web, and it will be nice to note their moulds - they're not resellers of Trumpeter plastic, it's already the opposite way! You should clear that point in your otherwise nice review.
Regards from Uruguay,
SAM