HashFast is an interesting and much aticipated idea but please tell precisely whats Your plan to send working product to clients at the end of October.
To me this plan looks like quite ambitious one. Slightly too ambitious? I dont see any place for errors and delays. None.

So we have known phases - please provide a list of actions with roughly dates.

To have working device we need to:

1. Design a chip : do You have final design, its valid/seems working etc.?
2. Produce Chip : ??Whats You timeline here
3. Design PCB : ??Whats You timeline here
4A. Assembly service : ??Whats You timeline here
4B. BOM - components preorder : ??Whats You timeline here
5. Create software or adapt existing one : ??Whats You timeline here
6. Design/Adapt Case : ??Whats You timeline here
7. Start shipping  : 20-30 October

Above its a quick and dirty estimation of critical minestones of which each one have many intermediate steps. Of course some of them can be done in parallel.

Please provide Your estimations. This will show us how do you approach this project.