Andy,
Can you feed back to Bachmann?
If so, happy that you pass on this picture, which shows the rear sandboxes on the late batch J72s - below the footplate, behind the rear footsteps - the CAD image for the late BR version doesn't show this. All the batch 69001 to 69028 had these. On the other batches they were in the cab, I believe. I don't think the earliest batch had the bunker rear handrail. I offered help to Bachmann earlier through the website, but that offer has not been taken up, as yet. Maybe you'll have more success.
As for all the moaning about the teak Thompsons, I can't believe that Bachmann could have done a better job - if I modelled in OO, I'd want a full rake! I think I can justify some N examples , eventually, to mix with some blood and custard.
Regards,
Roy