I voted to increase the hole size by a bit, not to make it more fun but to SPEED UP PLAY.
In the clubs I play most groups take forever to finish their putts. Drives me nuts.
For me, 6 inches would be perfect.
Interesting. As one who often fools around with making training aids from items laying about the house much to the chagrin of these inventors, I will probably play around with the tripod I have. I never would have thought about using the pool noodles perpendicular to the target line as most are set up to mimic your swing plane . I can see that you could place the tripod far enough away to avoid striking it, yet close enough to hit a noodle if off plane. I agree with Erik from the standpoint of supporting the guy's efforts. I've come up several ideas that probably could have made it to commercial production yet I did not pursue it. Kudos to Mr. Chiles.
Just a thought, but if the tripod could be adjusted low enough to the ground, a noodle could be affixed and extended to mimic a swing plane with infinite amount of adjustment capability. or....stick an alignment rod in the very end of the support member shown, adjust the support member to the lowest point to the ground, alignment rod 90 degrees ...and you get the idea.