Hi there D Chap, That is quite a masterpiece you have constructed. If you are looking for something more streamlined and "off the shelf", have you ever tried a forearm/gutter walking frame? There are several types on the market - with 2 or 4 wheels, with brakes or just stoppers, with/without a seat etc. Try google and enter - forearm gutter walking frame - and see what you get. The forearm supports mean that there is less strain on your hands - the weight is taken through your forearms and up into your shoulders. You would have to try this type of frame to see if it works for you - best to get a physio who knows about this stuff, or go to a showroom where you can try the frames out with a friend/therapist there to help you. If you only need the device for this walk you are planning, then perhaps you can hire the equipment. For outdoor use I'm guessing you would need 4 wheels, but can you operate handbrakes? For your consideration. All the best!