It may work, but it really poor design.
It may also NOT work, depending on the traffic loads of the various segments. At potentailly 700 meters distance, plus latencies, IMHO, the reliability would be at risk.
Are you going to run those redundant links by a diverse path, or just using them for bandwidth aggregation? You should not assume that traffic on the two (or more) ports is exactly split ... it usually isn't.
If the redundant links are not using diverse paths, then you have many single-points-of-failure.
IMHO, bad design, and should be avoided if at all possible.
"Stackable" means the switches can be ganged together and managed as if it were one logical switch.
Good Luck
Scott
