Sharing a fibre connection to get better value for money.

I am currently with a fibre provider and get 20Mbps/2Mbps for R929. My neighbours probably have a similar package. I am considering approaching 2 of my neighbours to split a 1Gbps/100Mbps among the three of us which will only end up costing R500 each.

I would say that I am the one who knows the most about networks among my neighbours and me (if I needed to guess), so I would probably have the main router and use cat6 cables and gigabit switch to split the connection to them.

Would this be a feasible thing to do? Are there any serious issues that could arise when doing something like this?