Staffy, is this what you are looking for?
This is my 1972 Honda SL125, fitted with a DIY springer front end made by my mate Wilso (with a bit of help from me) back in the 80's. It was originally made to go onto a raked Honda CT125 AG bike frame that he was building into a Lowrider. I ended up with it and my young brother fitted it into the SL125 to ride in a local Harley club event as a bit of a stir. The handling could only be described as interesting and it gave a whole new meaning to the term "flexiflier".
The lower links and front wheel are from a Honda C100 Cub (50cc stepthru), the shockie is off of a Honda, unknown model, but seamed to do a good job.
For the pivot points on the lower links, I would sugest a simple broze bush over a ball bearing as bush set up will be more compact and have a better load carrying capacity than a small ball bearing. Leading link forks are normally built with bushes for this reason.
One thing that you would really need to consider if you are going to make your own front end, is the legality of them. By law in SA, if you fit an alternate front end, i.e. leading link (for a sidecar) or springers they need to be certified by a qualified/licenced mechanical engineer. You can get around this by registering the bike with the std front end and then fitting the springer front end after you have the bike on the road, but you can still get done and have your rego cancelled + fined if the police or Transport SA pull you over to inspect the bike.