Edited 64 to 48 in the original post (my bad!).
I'm not suggesting that we use the technique of the current ****h baseplates on the Parts Tracker which combine top AND bottom surfaces into the stud. Rather we should revert to the current technique for the top surface (a single rectangle with superimposed studs) and, for example, a stug19-16x16.dat for the underside. In the ldraw/p folder this primitive would be a single rectangle, but in the ldraw/p/48 folder it would be a matrix of 48\stud19.dat references.
I'm not suggesting that we use the technique of the current ****h baseplates on the Parts Tracker which combine top AND bottom surfaces into the stud. Rather we should revert to the current technique for the top surface (a single rectangle with superimposed studs) and, for example, a stug19-16x16.dat for the underside. In the ldraw/p folder this primitive would be a single rectangle, but in the ldraw/p/48 folder it would be a matrix of 48\stud19.dat references.
Chris (LDraw Parts Library Admin)