In accordance with a feature of {HEAD ~ the invention}, the relative dimensioning of the elements is such that an assembly of standard KNEX components, such as shown in FIG 1, can be connected to {TAIL ~ compatibly dimensioned block elements} in a manner consistent with the normal spacing and assembly of such block elements 
In accordance with a feature of { HEAD ~ the invention } , the relative dimensioning of the elements is such that an assembly of standard KNEX components , such as shown in FIG 1 , can be connected to { TAIL ~ compatibly dimensioned block elements } in a manner consistent with the normal spacing and assembly of such block elements
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH