Yeah, mod bikes arent that small really, they are quite large infact, like mini moto-trials bikes but, compared to BMXs, Mod bikes are rather large compared to them, Mods can be longer and higher up and generally fatter in shape as the mod tubing is normally thick alloy, whereas BMX is stick thin 4130 tubing.
So yeah, Mod bikes are not small at all, and indoors they look massive!