Yes I’ll probably paint them at the same time Nick, as my workspace is such that it’s easier and quicker to progress lots of one thing then lots of another.
Forgive my curiosity but is there a precedent for that style of roof at the rear of a residential street?
Your curiosity is forgiven

It’s very specific question, for which the very specific answer doesn’t really provide the answer. But anyways, yes, I found one image of a Pent roof building (it’s not clear if it’s commercial or residential) backing onto a residential street. (The photo is from Bethnal Green, c.1900)
That said, is it really a pent roof or is it a lean-to? It goes to tile edge and any adjacent tile might have buildings that butt up against it (note that there aren’t any windows or doors on the tall side of the workshop, purposefully so as to facilitate this).
Does the fact that it’s commercial rather than residential make any difference? Well it’s a commercial tile (what with pub and butchers) but it can be butted against residential tiles. Whitechapel at the time was a mix of commercial and residential properties on each other’s doorsteps. Don’t forget that I have a slaughterhouse with all its resulting unpleasantness and there was actually one in amongst the houses. There’s also the gaming compromise that comes into effect, as I am picking from a mixture of elements that existed over an area and then condensing them into a fixed table-size space. If it was a Scale model it’d be less interesting. So the table isn’t a representation of a residential street, it’s a compacted portrayal of a mixed urban area.
Finally, I wanted something a bit organic to break up all the brick work. I’m imagining this building to originally have been a single story - perhaps akin to the mortuary the Ripper victims were taken to - which has been subsequently extended upwards (and being that it’s occupied by wood workers they’ve used wood).
EDIT 16/1/2020
I’ve now found some images of a Victorian pent roof building at the rear of a Victorian public house, the building having been used as stables, beer storage and as a workshop. Aside from being entirely brick built, whereas mine is half timber clad, it’s pretty spot on for my construction in terms of shape, positioning, and use. Only the shell exists as the interior of the building has recently been converted into a home.
Images are attached below.
