I tried to make a building as described by Mr. Cameron Charles in the April 2017 issue of GR. I got a piece of scrap, borrowed the angel grinder, marked out doors and windows, and set-to. Based on advice from another forum, I also tried using a fence to keep longer cuts straight.
Leaving aside "straight" is relative, I had a real issue with the windows. The grider is too big for the windows I had in mind; the Dremel doesn't have the "oomph" to be the primary cutting tool. i decided to halt while the project was nominally salvageable and seek furhter advice.
I am inclinded to simply make bigger windows, each roughly the size of the grinding wheel's diameter. The building would look guilty, but, at this point, this is a salvage operation in addition to a technique experiment. Is there a more elegant solution I may be overlooking?