Hi Mikkel - thanks for the kind words.
The setts are just the Wills ones. I cut off the edges (I think they're meant to be drainage channels or something) and butt them together as well as I can. then I go
over the joins with filler and re-scribe where necessary. To get undulations, I bend the sheets gently with finger pressure.
The original Will sheets (I don't know if this applied to the setts, but certainly the bricks and others) were made of a more brittle plastic that was hard to cut and didn't
take kindly to being bent! But they must have gone over to a softer plastic as I've found that the later packs are easily cut and bent with no danger of shattering or
snapping. In fact I use nothing more sophisticated than a pair of kitchen scissors to do the main cuts!
Where there are more obvious lines between the setts, in the pics above, are where sections are meant to lift out to enable the scenes to be swapped around. I just
have to live with those.