Yes, the reordering can be much manual work. For the gintro module, I do it automatically now, but it takes a few minutes to finish -- and it is based on gobject-introspection.
The ugly way is to put all types into a single type section at the front of the module. Many modules from early days like the gtk2 ones do that. But of course that is mud mixing, the resulting module is very unfriendly for the human observer. Someone recommended in the past to ship one mudmixed module for the compiler and one virgin one for humans. You may do that. Or, you may ask Araq for the pragma name which allows forward declarations. I tested it one year ago, it was working fine indeed. But was not really advertised or recommended. Or, you may wait -- future compiler versions may support forward declarations out of the box.
