I think they are long gone unless someone has the PDF.
The buildings were originally in Issue 146: Adobe Houses and Issue 154: Spanish Church and Terrain Boards
I have the PDF
Let me have your email address and I'll ping it over to you.
My buildings pretty much follow Gary Chalks style using foamboard, filler etc. And I don't follow plans, I wing it, but keep that quiet
If there are any bits you were wnodering how I did them let me know.