Rex Awesome job on the M25! I've wanted one for years too. The accurate tires are the real challenge. The Bruder ones don't look bad. I was going to use the Tamiya Globeliner or Kinghauler as the base tractor for RC. I was planning to cast (Rubber Urethane) the tires, but got interested in 1/6 scale more.

I think your M25 + trailer is much better than 15 feet standoff scale! Simply Superb.

Perhaps I will get one done by the time i'm 79 LOL (50 now). Happy Birthday - and many more. Enjoyed your scratch build immensely.
Bob