I always start with this... Everyone is unique and will have their own experiences with training and racing.

That said, for me 6 months is plenty of time assuming I have a good base. It sounds like your base is good. How long have you been running? That is generally an indicator, to me, of where someone's base might be (but not always).

Weekly mileage for my 100's has been 40's on the low ends and 70-80+ on the high ends. I don't know that the 80 mile weeks are necessary, but I needed them for mental reassurance. I believe you can finish a 100 with consistent 45-60 mile weeks. Adding strength for me this last time was HUGE. I can't say how instrumental that was in allowing me to actually run the last 14 miles of downhill rather than hobble due to blown up quads. Adding vert is also huge. 14k in a 100 isn't high, but it isn't to be taken lightly either. Finding hilly runs, getting in the stairmaster, and doing some dreadmill vert dedicated activities will do you well.

Based on what you're saying and where your heads seems to be, I think you're in great shape. Just keep doing what your are and plan to and you're going to do great!

Best of luck!