The 9F, a standard issue tender driven Hornby 'Evening Star', was inherited in 2001 after the death of a good friend.
As a sort of tribute to him (he used to rebuild old cars to concourse condition, so would have appoved of the upgrade), I decided to turn the engine into a proper workhorse rather than be the rear powered bluffer the Margate factory decied it should be!
Rather than use the mint Evening Star body, at a local show I picked up a tatty 9F body and tender for a few pennies. On this one, I stripped the body and tender right back, replacing all the moulded gubbins with wire and new brass bits like handrails and brackets etc. The missing front steps were formed up from the brass sheet. The outcome looked great, but of course, being tender drive worked like a dog and jammed going thouh my bullhead pointwork on Combwich due to the Tupperware wheels on the tender drive. At the time (2002), which is before Bachmann bought out their gem, there is/was a business which performed loco drive conversions called 'Model...sumitorother' (cannot recall name) to new locos. I contacted them to see if they'd do me a conversion to an existing loco instead.
A week or two later, a fully functioning chassis came through the post. That's about it! Of course, with this progressive upgrade, in the end, none of the original loco was touched!