That body is repairable with a little work with plasticard and filler. While you are at it, it would be worthwhile to remove the moulded on handrails and insert wire replacements.
I have repaired Triang/Hornby bodies like that before; a Pannier tank which had a large triangular chunk out of the rear bunker and buffer beam, and a Standard 3MT tank with similar damage plys a bit of the front buffer beam missing as well. Just use lots of solvent to fuse the plastic replacement bits in place and allow plenty of setting time before filling, filing and painting.
Of course, you could buy a complete replacement body from the likes of Modelspares or East Kent Models - they aren't all that expensive. On the other hand, there is more of a sense of achievement if you can do it all yourself (like you, I like the challenge) - and you save having to oil the hinges on your wallet!!!
If you were prepared to spend a little extra, you could also get some brass extras, such as the roof fan grille and fan, which would also allow you to correct the position of the fan - something Triang-Hornby got wrong originally as it should be off centre. While the Heljan Hymek is better, the Triang/Hornby one was never a bad model to start with. I have one which is in the process of being detailed with brass fan, separate handrails, etc. and I twin-motored it and through wired all the pick-ups. It runs very smoothly and will pull anything I put behind it (not quite as smooth or quiet as the Heljan mech but will still crawl along reliably if asked to do so), and it looks quite alright parked right next to the Heljan Hymek.
I have repaired Triang/Hornby bodies like that before; a Pannier tank which had a large triangular chunk out of the rear bunker and buffer beam, and a Standard 3MT tank with similar damage plys a bit of the front buffer beam missing as well. Just use lots of solvent to fuse the plastic replacement bits in place and allow plenty of setting time before filling, filing and painting.
Of course, you could buy a complete replacement body from the likes of Modelspares or East Kent Models - they aren't all that expensive. On the other hand, there is more of a sense of achievement if you can do it all yourself (like you, I like the challenge) - and you save having to oil the hinges on your wallet!!!


If you were prepared to spend a little extra, you could also get some brass extras, such as the roof fan grille and fan, which would also allow you to correct the position of the fan - something Triang-Hornby got wrong originally as it should be off centre. While the Heljan Hymek is better, the Triang/Hornby one was never a bad model to start with. I have one which is in the process of being detailed with brass fan, separate handrails, etc. and I twin-motored it and through wired all the pick-ups. It runs very smoothly and will pull anything I put behind it (not quite as smooth or quiet as the Heljan mech but will still crawl along reliably if asked to do so), and it looks quite alright parked right next to the Heljan Hymek.