Hi guys! I'm new here and this is actually my first post. Although I am not the uber nerd you hoped for, I can probably help. I have worked a lot with these devices for the past few years and have made a variety of different objects levitate using them. So much so that the company that owns the rights to the tech asked me to consult with them on future product ideas.
The models that are out now are older first generation and won't hold much weight 3oz, there are newer versions which hold more weight but of course they cost more. The ones I have now hold about 16 oz or a can of soda, a shoe, etc.
They have actually eliminated the weight factor altogether but the more weight, the bigger and more expensive the unit. They have also fixed the balance & stability issue. There are now even ones where you can move the levitating object. By that I mean imagine a small ball that hovers and you move it via a joystick thru an maze like obstacle course.
That being said, I started with the first gen models and what it comes down to is learning to make things ultralight. You have to forget everyday building materials. A training remote is easily possibly as is a delorean. I'm sure I could do either on the unit I have now.
Let me know and I will try to help out. Way to much information to try and put in one post, especially my first.