Tek screws are 10p or something? A decent drill is £2.00 and struggles to go through metal without coolant. I don't even have to try it to know what will happen 
Hold board to ceiling, fix uprights to hold it in place, the width of the board and the pressure of the uprights will stop it going anywhere. Gripfill if you fancy it. That's not the normal way of doing it btw, just a way to do it in this situation.
Don't forget to measure according to width of plasterboard and add a noggin for sockets and skirting. Predrill holes for wiring.
A hiltigun gun may work, but that doesn't mean it is the correct choice. Plus you will kill yourself.

Hold board to ceiling, fix uprights to hold it in place, the width of the board and the pressure of the uprights will stop it going anywhere. Gripfill if you fancy it. That's not the normal way of doing it btw, just a way to do it in this situation.
Don't forget to measure according to width of plasterboard and add a noggin for sockets and skirting. Predrill holes for wiring.
A hiltigun gun may work, but that doesn't mean it is the correct choice. Plus you will kill yourself.
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