The Toothpick and BabyTooth designs are great low weight options for quiet, safe optimal fun. The heavyweight 3" is also lots of fun and is needed if carrying any payload, like the DJI Vista unit, is desired alongside any actual flight performance.
In designing the setup around the current and future micro electronics, we discovered an annoying design limitation. The most obvious design layout would be to stack all the electronics. The dilemma there is that either the battery is slung under the frame or hoisted way up in the air above the electronics. Neither of which is preferred for flight performance (racers excluded, those requirements are different). The other slightly less obvious option is to spread out the electronics side by side. This allows for a really nice and tight weight distribution and CG, but results in a fuselage that's a bit longer than desired. The resulting fuselage is closer to that of a 4" design rather than a 3" design.
We've of course gone with design option #2 because it will yield overall improved flight performance. The frame weight will be low enough to be decently optimized for 3" but it makes more sense to make it a 4". So the end result will be a design built for 4" that will have a bit of prop in view of the DJI/analog FPV cam and the gopro that may be mounted on top. There will be 3" arms that will not have props in view and there may even be 3" arms designed to take cinewhoop props.
The mounting platform for the gopro mount will be the same as on the Cineglide and Cinewhoop.