Mac Plus Booted from SD card/USB stick??

Hi all,
Now I've gt my Plus up and running again with a new logic board I have been messing around and got it booting from a SCSI Zip drive instead of the 40MB HD. The 27 year old system and demo disks still boot fine as well
What I would really like to do is boot from silicon - SD or USB stick. It is probably impossible but has anyone attempted this?

Cheers,
Mike

Amazing! You've gotta love the internet!

I'm going to order one in a week or so. My internal floppy drive is playing up and I was going to swap the mechanism with the external, but I might try fitting this inside instead. Won't know till I see it in the flesh of course!