how do they do it...

[wilfy]

just to give you an idea what i'm thinking of doing... i'm basicly building a bubble tube for my boys, the tube with the water is all but done.

but i wanted to make it more interactive, so my thought is to have a panel with big bashable buttons on it and also removable pieces as per my picture above but i want to push it further and have them pieces interact with the tube, so they will have lit acrylic pieces under them and a mag sensor of some description so when you pull the piece away the hole lights up and when you put it back in it interacts with the bubble tube.

the reason for bringing this to you guys is i want to create this whole piece before i'll have my cnc machine made...

so i need to know how i present what i want in a drawing or whatever so that i can contact whoever may be willing, to pay them to craft what i need.. if that makes sense

here is a picture of what i have in mind to better explain it