Hi Pete, thanks for asking… I've been hibernating!
When it was confirmed that the correct tender for 44890 was part-welded, I was going to attempt the necessary mods but as the spring dampers are the short versions, I chickened-out, deciding it required too much faffing. So, the tender in this thread will now be designated to a Comet-modified Hornby 8F (more of that in due course). For 44890, I bought a Comet part-welded tender kit only just recently, so it looks like this thread still has some time to run… hopefully starting again in a week or so!
As for your Hornby body, no doubt you'll know that Comet sells individual add-on bits, whereas I don't think that Brassmasters does, although the latter will always come in handy for spare parts. Will you be starting a thread on your work? It sounds a bit more involved than the stuff I'm doing and I'd be very interested to follow that.