A RTK Paradyme WITH a 900 radio and Glonass unlock is $18,000. 
 Then add the Integra and what every tractor kit you need. 

You can use the Integra and the trimble antennas but that only leaves you with the Ontrac 2 to steer with.  You need the Paradyme with the Integra in order to use the hyd steering block.   there are kits to use a Paradyme with a Trimble hyd valve.  

Sounds like you have some bad info or understanding of the equipment.  You need to find a dealer that will lay it all out the right way.

I am not convinced peiceing together a system is the best and cheapest solution.