Blimey! I used to have one of those.

Looking at it's proportions it's certainly better than the Mainline offering.

Taking off the tension locks would be good. Parkside do a nice pack of NEM coupling pockets for a Bachmann coupling.

Other than that I'd probably look at replacing the roof rain gutters with Microstrip and a couple of MJT vents and you'll have a nice model.

Alternatively leave well alone and lightly weather.

Look forwards to seeing the finished article.

Cheers,

Mark