That looks like a bum setup and a few bad ideas. I'd start with a normal LAN first.
Also, keep it to ONE ROUTER and for the second router make it a WAP.
Here's my Predicament....
I have 2 wireless routers one (Router 1) just regular internet and a second (Router 2) running open VPN . I have some items that can't run threw VPN and some I want to encrypt securely threw a VPN. bother Routers are connected Wan of Router 2 to Lan of Router 1 (See Bellow) and then Router 1 to the modem.
There is a Computer (Computer 1) connected to Router 1 that has a program that can't run threw a VPN
and a computer (Computer 2) connected to Router 2 that I want everything on it threw the VPN
Now what I want to do it share the drives connected to computer 1(which is connected to router 1) with computer 2 (which is connected to Router 2)
Computer 1 : Windows 10
Computer 2 : Ubuntu Linux
Routers are wired as follows:
Internet/Modem<-----------<----------Router 1 <--(Lan)<-------------(WAN)--Router 2 / VPN

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