Good for you!
Our field still has standard ten pole plots but also has a lot of smaller plots, mostly five pole, with a few at two and a half. The five pole plots seem to suit people who are going for that bit extra, because after allowing for a shed, compost box, a rhubarb, a bit of soft fruit, say a blackcurrant and a gooseberry, and perhaps a few strawberries the remaining area usable for vegetables will be quite modest. You might find after a couple of seasons a few of your "thirders" may want just a bit more.
But that is nitpicking.
A great idea and good that it worked out so well.