Just thought I would add the Lily Lake observatory in Northern Illinois. This is a roll off that opens in both directions. It holds two telescopes. It is built using normal specs. The roof sections are pretty heavy but roll on a gate track on whells that are grooved for the track. Very little friction.
-------------------- Enjoy the dark,
Herman
Meade
14 LX200 GPS SMT
12 LX200 GPS
7 LX200 Maksutov
ETX 125
TAK FS128 NSV
Sky 90II
Lunt LS60ThaDS BF1200
Canon 5D Mark II
Illinois
Iowa