I spent about 3 hours today in the Maker Hub working in Autodesk 123D. I was able to finish a concept design for the Walker shell. This of course will only be the prototype shell because the finished product would ideally be much smaller. The dimensions are roughly 120mm by 56mm by 42mm. More updates are coming later this week. A big test will be whether the loops fit the collar and if the plastic is durable enough. T-minus 8 hours until the collar attachment is done printing!