If you’re into post apocalyptic games such as Gaslands or Battlecars, you may find this guide to scratch building weapons for 1/64 battlecars useful.
Modeling
Modeling A Medieval Fantasy Inn
Here’s a good video on modeling a medieval fantasy inn.
What Plastic Model Scale Should You Use For 25mm Gaming?
David Ferris provides the answer to one of the most-asked questions in miniature wargaming: What plastic figure scale should I use with my 25mm wargames figures?
Modeling Ruins
Wyloch has some good tips here for modeling ruined corners. Corners are among the strongest parts of a building, so they will naturally be prominent parts of ruins.