I am building an OpenMoco timelapse rig and have gotten one tiny piece of the project done. My dolly. I decided to build a ladder dolly system mainly due to it's strength and light weight. I can also find a ladder just about anywhere if traveling on a project. I also decided early on to use 8020 aluminum profiles for the dolly. The goal was to be light weight and very adjustable. I could have made the dolly lighter with 1" sq tubing but the adjustability provided by the profiles is pretty important. Most of the parts are 20" or less so they fit in a pretty small case to ship. check out the images here . . .
The ladder is really filthy but even so the dolly rolls really smooth.
Now it's on to building the drive. The only problem now is the really long lead times for the stepper and gearbox from Anaheim Automation. Backup plan is to also purchase some Meade drive motors as a quickie solution if my project this is being built for comes all of a sudden. Another thought is to buy a 1rpm gear motor and use a Pololu Jrk motor driver as a continuous drive mechanism. I could use the same gears and shafts just a slightly different motor mount. Also this week I need to start futzing with my Arduino and get the electronics sorted out. Still mulling over ideas for the enclosure. I had thought about just putting everything in a Pelican case. I had decided in the past few days to put the motor drivers on or near the motors and just output S/D and camera shutter from the control box. That way motors can be tuned for their purpose, drive or pan/tilt.
Well many things to do and not enough time or money!