These tools costs very much money. Even renting them. And when you want something thats not really standard yet you need to work together with the software developer so they can fix every problem when it happens.
When i thought about creating 14nm Asic's with someone i called such a company by phone. Flowcad. And he spoke with the creator Cadence. Its not possible to simply buy such a product because the tech is not yet developed. That means you would have to sit together with TSMC, cadence and work together. Because the software isnt ready. The steps in between has to be finetuned all the way between all parts. He claimed its nothing like it was with 300nm once. There are no geometrical rules anymore. You have to have the rules not only in the last step, you need the rules all the time developing from the first step because the design has to be proofed from the start designing and is checked with every step done creating the design. Otherwise you could include your design into design software to check the foundry rules are applied. Thats not possible with low process nodes anymore. You need the software for developing.
Renting low process node development software costs 70,000€ - 80,000€ for a half year for analog and starts from 800,000€ for digital ASICs. Thats renting alone.
I have used software like Cadence in the past to design my own ICC in the past. If the software isn't ready for 14nm, and the manufacturing process isn't even ready, then that more or less means we should look at manufacturing process that does have software ready.
In your research how is the software like Cadence licensed now that geometrical rules are no longer used. My experience involved those rules, the software was easy enough to learn. You started with the basic and worked your way up. The major problem I see is unless you can spread the actual work around, have different design tasks, that this would be a ton of work for a small group of people.
What we have going for us is the fact we have an overal idea of the design itself. We know how both SHA256 and SCRYPT. All we have to do is figure out which ICCs ( AND, OR, NOT ) and in what combination to implement the design. Everything we need to implement can be implemented using those three operations.
I forget the name of the software I used, it might have even been Cadence, this was back in 2008 and it ran on Linux. The version of the software itself was note even current. What we designed was actually manufactured at the end of the project.