Just a quick update on the dollies and availability.
I have had a very hectic schedule for the paast year and especially the past several months ever since July. I won't be able to produce kits or the finished dollies in the near future for now, but I did put the PDF files for the plans and instructions on Page 2 of this thread. I encourage anyone interested in these to enlarge the plans and make the dolly themselves. It is really not that hard and only takes a jig saw, a drill, and a bit of time.
I have found that a single piece of 3/8 ply that is very high quality (8-10 laminations or more) works very well as opposed to using the 1/4" with doublers. The lengths for the threaded rod and the bolts may have to be adjusted for this, but that is minor.
Please contact me if anyone needs source information for any of the materials and I will be happy to give you the websites and/or contact information.