That would be interesting. never seen that myself. we use and highly recommend the Groundskeeper 11 rake from Wesspur. power cleanup is a good thought, as long as you have hard ground. i'd hate to try and save time only to have to re-seed a lawn. i'll look forward to checking out what comes up here. . .
I've been thinking of making my own BMG but would like the rake as well. The materials add up pretty quick to make the grapple but see there can still be a good saving if I can find the free time to make it. I have yet to find the material to make the steel rake but someone told me to look at street sweepers.