8x10 pin hole – Very Nice!
But I hope the next one will be a 5x7.
As far as I know, neither Kodak nor Fuji sell 5x7 sheet film, BUT Ilford does (as Foma and perhaps some others too), so why doesn't Harman make a 5x7 pinhole - after all a 5x7 contact print is a decent picture!
Hoping for the best!
(though just planning to build one myself)