Great post Christian, I really like all your suggestions for potential new buildings in the range, and I really enjoyed seeing all the ideas brought up in this thread so far!
Out of the items already mentioned, I feel the Signal Box and the sheds (both Narrow Gauge and Toby's) would be the most practical. They aren't too large where they would drive up costs. They are also directly related to railways and not just for background scenery on a layout, which would probably make them more interesting to potential buyers.
Personally, I have been thinking about new buildings in the range since the release of the HO scale figures last year. Buildings that go along with the new figures could be a cool way to build up a little scene on a layout. Toby's Shed would be a perfect fit for this considering that model was also used at McColl's Farm. And obviously, The Narrow Gauge Sheds would work with the Narrow Gauge Personnel. Maybe they could even make Mr. Percival's house, but I understand that one might be a bit too niche.
When it comes to the background scenery type buildings, I really like what sodor_modelmonger said about unique signs. Making these buildings that have distinctive and recognizable names from the series would really help to make them stand out.
Ffarquhar definitely seems the most reasonable option for a new station building considering its significance in the series. The model was also used for one of Wellsworth's station buildings on the show, so that may give Thomas modelers another incentive to purchase it.
I also really like the Maithwaite Mine Building, just for the fact I've always been a fan of the episode Percy and the Haunted Mine.
Out of the items already mentioned, I feel the Signal Box and the sheds (both Narrow Gauge and Toby's) would be the most practical. They aren't too large where they would drive up costs. They are also directly related to railways and not just for background scenery on a layout, which would probably make them more interesting to potential buyers.
Personally, I have been thinking about new buildings in the range since the release of the HO scale figures last year. Buildings that go along with the new figures could be a cool way to build up a little scene on a layout. Toby's Shed would be a perfect fit for this considering that model was also used at McColl's Farm. And obviously, The Narrow Gauge Sheds would work with the Narrow Gauge Personnel. Maybe they could even make Mr. Percival's house, but I understand that one might be a bit too niche.
When it comes to the background scenery type buildings, I really like what sodor_modelmonger said about unique signs. Making these buildings that have distinctive and recognizable names from the series would really help to make them stand out.
Ffarquhar definitely seems the most reasonable option for a new station building considering its significance in the series. The model was also used for one of Wellsworth's station buildings on the show, so that may give Thomas modelers another incentive to purchase it.
I also really like the Maithwaite Mine Building, just for the fact I've always been a fan of the episode Percy and the Haunted Mine.

