It will not be a Bay Deltic in the original sense, rather it will be a replica aiming to produce the ambience of A Baby Deltic, the fact that is a mix of parts that will have been used on other types of loco is not truly important, if they can create something that looks and sounds the part that is what matters.
I see hope in this in that once lessons have been learn't from this project it might be possible to recreate replica of other long lost locos using redundant bodyshells and parts sourced from elsewhere., one example might be to built a replica of either a North British Class 21 or Class 29, Class 309 Motor bogies (if any are still available) look similar to Class 21/29 bogies, and I believe that the Paxman Ventura engine was used on some Italian locomotives so suitable Engine/Generator sets might still be available.
Other possibilities might be a replica of one of the LMS twins (although suitable bogies might not be available}.
Just a thought.
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That's a really fascinating project, great to hear that it's making progress, I would love to be able to see and hear an operating "Baby Deltic" (Far too young to have seen them first time round).
Plus 37372 is one of my favourite 37s, so it's good to see that it will live on in some form, and is contributing to such a worthy cause. I wonder where they found that last remaining power unit?
I had one distant sighting (and sounding) of D5901 at Crewe in 1974 when it ran around a test train near Crewe South Signal Box, I was at least a couple of hundred yards away at the time but it still sounded impressive
Back in the early 60s, I had a Lone Star train set and one of the locos type Lone Star modelled was the Baby Deltic although at the time I wished it was a D200 (Class 40) that they had modelled!