"If the pictures on the web site are correct, the HO model has the same window issue."
The images appear to be the same for both scale models. The cloud placement makes this pretty clear.
Some of the structures would be of interest to me but finances don't necessarily make it possible for me to pursue them.
That said I do hope that they consider doing the power plant and turbine building in N-scale... there are a lot of modelers who could really appreciate the amount of detail found in these models... and a number of them who would do their best to work them into their layouts.