These will certainly be a challenge! When I used the AnyRail program as a guide to get an idea of all the buildings positions and their sizes on the layout, I also drew out a section through view of them on a spare piece of 3.0mm thick MDF to get their relationship to the baseboard’s structure i.e. support joists and risers.
My reasoning at the time (2015) was that because the Dandy Mire Viaduct needed the diorama depth to accommodate it and I intended to have a lower return tracks/fiddle yard beneath the top baseboard.
The latter could change due to a possible alternative of maybe using a dual Transverser system at each end of the layout.

So as I developed these ideas, the diorama board holding the Railway Workers Cottages was suitably redesigned to have a 3° slope around the station area. When looking at pictures of the Stepped Terrace houses they are on this approximate slope, whilst the rail side Terrace houses are level.
Now as I commit to build them, the rail side terrace houses will be first with the stepped terrace houses on the 3° slope later. More on the baseboards and construction once the buildings have been made.

The first thing I did was to make some cardboard mock ups so to evaluate their actual size. This also proved handy as my dimensional drawings needed to be modified slightly for the upper window lintel height versus the barge board/gutter line on the roofs.
Then I had to attend to the end elevation drawing that affected the wall height as well.
As yet I haven’t come across sufficient dimensional information to gauge how my own stack up.
Lets hope I got it right!