Good luck, but I have yet to meet any "HVAC" guys that work on cascades. Simply because HVAC stands for heating, ventilation, and air conditioning. None of which cascades do.
Please don't simply TRY something to prove something, we see that hear quite a bit, and people end up huffing up a pound of refrigerant or wasting money.
Blake does have knowledge in cascading units. He just finished a job involving just that but on a larger scale. I have faith in his abilities but the proof will be in the end result. A result in which I hope will be a successful one.
Worst case scenario! I'll start from scratch with new components.