So. The project would be really great if it were to make use of the slick, speedy capabilities of GeoPackage. GeoPackage 1 is beautifully documented, with slick interactive demonstrations of every nook and cranny of the system. It depends on OtherPack version 3, produced by a different programming group. OtherPack version 3 is no longer distributed because OtherPack 4 is so very much better. GeoPackage 1 can’t work with OtherPack 4, but, GeoPackage 2, which is lurching towards alpha release, does. GeoPackage 2 doesn’t have any documentation but there are many points it has in common with GeoPackage 1 and it even has a dozen demonstration pages showing how neat it’ll be if it ever finishes working. Oh, but, GeoPackage 2 actually only works with OtherPack 4.0 and 4.1. The OtherPack group just got OtherPack 4.2 released and GeoPackage is sadly incompatible with the new release, although this isn’t worth mentioning anywhere except on a desperate-plea-for-help web site where the original question is accused of being “terribly vague”.