I agree the entire thing sounds completely impractical and even if it can be made to work reliably, the number of suitable payloads would seem to be tiny. Maybe

I agree the entire thing sounds completely impractical and even if it can be made to work reliably, the number of suitable payloads would seem to be tiny. Maybe you could launch a 200kg billet of solid aluminum or titanium or other raw materials that could be used in space for manufacturing of components for a space station or Mars transport vehicle?