I draw it with Solidworks. Solidedge should be another good one, but I've never had a chance to try it personally.
Otherwise there is Google SketchUp which is a good choice for a newbie, at a good price also (it's free...
![envious :mrgreen:](./images/smilies/icon_mrgreen.gif)
- just be sure to download the right version, there is also a payment version). It's less powerful compared to the other two, but very easy and quick, once you get a grasp on it. (less crowded with buttons also).
As far as the washers, I would need a total of 16 of them (4 per link), 18mm ID, 25mm OD, 3mm thick, or something like that, if needed I could turn them down, or enlarge the hole.. Let me know if you can find them in metric, in case I've got a good freight forwarder in Miami so that you don't have to go through the hassle of the international shipping..
![Wink ;)](./images/smilies/icon/wink.gif)