I don't know if I'm going crazy or if it was just too long a day at the office, but I think I found an error in the Sport Trainer plans.
I keep "losing" a half inch whe I try to lay out the clusters on the sloped longerons, both upper and lower. I have double checked my datum lines and they are in the right spot (I believe). But between upper stations 3 and 6, as well as between lower stations 3 and 8: I find that the cumulative measurements between stations add up to 1/2" more than the distance between the above mentioned stations.
Anyone else run into this? Or do I need to go back to math class?