Even if starcraft could hold 65,000 units or whatever, many players on bnet would lag immensely if there were this many units. 1700 units is a high limit to be stuck under, in reality, so I am sure you will eventually figure out a way to cope with it. However, it is possible to completely fill a 64x64 map with sunken colonies..

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Agreed with Fritfrat. Many players would lag themselves out. Plus the dimensions of your map (5x51) it can hold up to 255 sunks... but what else? nothing exept air units. What were you thinking?