Meanwhile construction continues on the tunnel. In these images you can see the half-hoops assembled. 3 of them so far. We cannot assemble an entire hoop and get it out of the garage! The plan is to bring out the half hoops and then fully assemble. Each hoop is made of 16 segments overlapping and bolted together. We are running into a glitch trying to find a suitable bike wheel rim that will fit the hoop's edge. Apparently there are no reliable specs on bike wheels in general in terms of true diameter and channel width. The first wheel we tried was supposedly 1 1/8 inch wide and 20" diameter and actual measurements where .8 inch and 17 wide! I am working with the bike shop in earnest to find a suitable wheel.
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