Hi chomps. The reason these maps are separate is because:
1) They don't belong to each other and have completely different themes.
2) They would be way too large combined.
3) You would have so many errors compiling/loading it, that crysis would feel it.
4) If by some miracle it compiled, it would take about 50 years for the average noob to load it on start.
5) The pk3 would be massive.
So, instead of taking other peoples maps and turning them into a giant mosh pit, find some tutorials, find some patience, and make your own.