Just had a nice thought, some of you may know that I have built some Bike lights using some MR16 Halogen bulbs.

Now after building them and wiring them up, I need to find a way to mount them on the handlebars of my bike, im probably going to resort to using rolling pins, tin snips, and some old coke cans to make an enclosure to hold them, but im curious...

How difficult is it for a newbie to design a cylindrical enclosure with the necessary openings for wiring/switches and the bulb using some free cad software??

I dont have a graphics tablet, I dont have any prior knowledge of cad, and ive never ever used it.

Any hints on where to start? what software to use? and how to do it??

Google SketchUp

not sure it will do what you want but sure is pretty  

lol it looks like fun and easy. But I dont think I could take a sketch up model to a fabricator and get them to mill me out a model using the instructions contained with in.

dont know till ya ask  

some linux cad freebies, use one of them

Brummie this looks brilliant mate lol just watched another video tutorial of it. Really quite in depth as you go along Quite like the look of it.

If anything itll allow me to have a play around

Ah bollocks mate... its gone sh*te again. you cant make holes in curved surfaces. So I want to make a hole on the side for a push switch, but it wont let me.

id help but ive never used it myself  

lol this is frustrating!!! Ive gone for a simple two holes in the back affair, but its having none of it.

Also if I had the dimensions of a glass fronted Dichroic MR16 bulb would be better.

I think the diameter is like 51.2mm but not sure.