Bruce,
That is very pricey for that calendar. I hope it has both the calendar parts and the accompanying letter. I believe I picked up mine at York for $100 (not positive).
Is that an old Zenith repairman's kit I spy with my little eye?
As for your Erector set bridge, I'm not in a position to cast stones. My search for my bridge has taken years (at least 10) and all sorts of ideas for interim and temporary structures have passed through my head. The original was a metal shelf created by a kitchen shelving company that moonlighted as a bridge maker. 
After awhile, every time I ran a train across it, I held my breath. 
Hey, your Erector Set bridge looks better than mine did! 
George
