Have just fitted adjustable dampers to my Chim, and am anticipating having to crawl under the car a fair few times to get the settings right, could not face having to jack it up that many times, so knocked these up from some offcuts in half an hour, work perfectly..
Good effort! I have been thinking of preparing something similar myself.
I would probably say though that the upright wheel stops would probably pop-off if you drove a little but too far forward. Would this expose nails/screws that your tyres would roll onto?