yes, you should be ! 🙂
now your question is clear : what is the “software” limit on the number of inner trx 🙂
I thought you wanted the “sensible” limit, according to radio engineering guidelines.
Well, you can create a cell with up to 16 TRX. The number of TRX you could put in the inner zone does not seem to be limited in any way. So, according to the doc (and as far as I’ve read!), you could do this:
4 outer + 12 inner
But really, one cell with 12 trx… it would be better to add some micro BTS’s around, to unload this cell. Your freq planning must be a nightmare !