The other issue we do not need to be concerned on this one is shipping/postage. Since everyone sends out the F8 and everyone sends the blocks to their recipients, the postage will be a wash. No prepaid envelopes needed. Right?
I think it would be important for the participants to get their F8s out as soon as possible so we will all have the same amount of time to work on the blocks. (Not that we necessarily would - but we could. gggg)