This was very useful, thanks for posting.
I’ve recently started in EM Gauge and also purchased the newly tooled Hornby Terrier with the intention of doing an EM Gauge conversion (I’m modelling the IoW in the later 1930’s, so not a lot of options in terms of locos – I’ll probably settle on a couple of Terriers and a couple of O2s!).
Do you have any pictures of the conversion to share?
Seeing some of the challenges, I wondered if it would be viable to scratch build a new chassis instead of converting the Hornby one?