The Gestalt is a pretty nice feature from 3.5 edition, allowing to pick 2 classes for every character level.
I couldn't find any information about it in Player's Handbook and neither in Game Master's Guide.
How could it be resolved as homebrewed? What would happen if you would gain the same feature twice? Could you pick the same class twice in order to get two archetypes? **Answers must include Your own experience with decribed homebrewed rules.