So I've been tinkering with the idea of getting a sidecar rig to do grocery / kid duty and icy roads in the winter. Course, can't afford anything but I have a decent pile of metal / scrap parts and an ultimate set of tools... Not that I need another project, and not that this project will go anywhere but I finally decided I wasn't going to find a suitable bike for the sidecar to go on in my price range, so why not attach it to one I've already got?! Current plan is to use my '75 XL350. I know, small and underpowered. It's not likely to go more than 7 miles to school and back, and as long as it can hold 55 mph I'll be happy. Spent the last couple of days doodling and perusing the hack picture thread. Here's what I've come up with so far. I plan on using either an XL or an old CR elsinore swingarm, wheel, and shock. My biggest concerns at this point are the swingarm attachment and the rail style car attachment. Is one rail like this considered pretty solid? Seems like even if the clamps are tight, over time the sidecar would sag or spin in the clamps. Maybe a double rail like this would be better? My concern with the swingarm is this - do I need some vertical support like I put on the shock to prevent the frame from twisting? Do I even need the triangle on the shock, or would a single upright be sufficient? Just for fun, a pic of it next to a bike... So these are just real quick off the cuff drawings. No measurements yet, and no idea what I'm doing but I kinda like it like that. My thoughts are to get a decent design figured out and build a car like the one pictured. Get it mounted and test it out for a while, then if I like it I would build a body to go on top of it. Probably something along the lines of a Ural, but maybe a little more art-deco / vintagy and definitely aluminum. Open to all suggestions and comments!