In the 60s I often had to work where there was no power . I used a hammer and star drill for cutting holes in brickwork and concrete. A hand drill for small holes in metal and wood. A set of Scotch auger bits for big holes in wood and a ratchet and pulse drill for big holes in metal plate. Only ever used the latter once and would prefer to die before it happened again. :(
If the platform was made of wood then an auger bit would have been adequate to make bolt holes. I used them to make up to inch and a half holes in 8 inch baulks.