This is not a good idea.
This can be done by multihoming the clients to both hubs, etc. In theory it works, in practice, the collisions and the load balancing problem screw up everything and the network actually slows down.
Plus the time and costs of design and wiring are not free.
Each of the four switches does have its own network card in the server(s), Correct?
No chaining, Correct?
On a low budget, that is what helps network performance. 100/ NICs are cheap.
If each switch can communicate with the server at 100 or better on its own wire/NIC, it helps a lot.
Regards, Chris