8/10/25mm Construction Kit Answered
I would like to propose a standard for the design of an "Erector Set" type construction kit based on a standard 10mm thick by 25mm wide rail with 8mm holes spaced 25mm apart. The metric sizing would insure a global participation in the design process. The main construction rails could be built from any smooth grained hardwood such as hard maple in North America or several other species I have seen used in Europe or ABS plastic, Aluminum, etc.
Alternatively, a 5/15 - 3/8 - 1 inch format might find greater acceptance in the US which would allow for use of many standard components such as skate board wheels which use a 5/16 shaft for bearings, etc.
Given a standard hole size, thickness, and spacing, a variety of 3D printed components could be designed by the community as add-ons to the basic kit. Ideally such designs would be done in Autodesk Inventor based on PARAMETRIC MODELS that could be adjusted for say both a mm and inch standard.
Laser cutting at TechShops, 3D printing, and other simple home shop built components for connectors, etc., as well as suggestions for utilizing other standard building components such as say plastic tubing for spacers, and other standard hardware components, would greatly expand the features of the construction kit.
Ideally Makers, TechShop members, home woodworkers, etc. would produce kits and make them available to "young inventors and engineers" in our school systems as a community project.
While I have suggested the above mentioned dimensions, these and other basic considerations should be vetted in a crowd sourced forum before any standards are set.