Hi,
My proposal is to start to work on the prototype as soon as I get the HW, to make you safe you'll not pay a penny before I show you a video of a working devices, this reduces your risks to the HW only in case I fail or if you're not happy.
This said I need some information that perhaps could save some money in the prototype and have it consuming less power: is one or more full revolutions of the platform envisaged or it will tilt no more than, say +/- 30 Deg. ?
Also, for the duration of battery, what is the capacity of the battery you plan to use ?
Apart for the plain hw cost there are assembly/delivery costs: I suppose that they will be accounted separately, I'm right ?
Please let me know.
Alex.