With 3.5 hours to spare!
So, I did it. And here is the proud Birthday gal with her Bean Bag which she loves.
I finished the whipping, did the lining, attached the strap and was finished by 1:18 p.m. on Saturday.
Don't ever under-estimate the value of a definitive deadline. Although you wouldn't want every project to be quite this tight.
A challenge worth the rush!