Oho!
Thirty Years, are you sure? That's the old White Box Export edition. Oh, By the way.It's good you've gotten some advice on the pit. When I built my first one I had a neighbor that helped the "Little Neighbor Kid" build it right . Mr Ryan may you rest in Peace.
He served with the Eighth Air Force in Europe. He got transfered to a to a new unit just as the War in the Pacific ended. Oh, the stories he'd tell!