Module A = 50 x 50m = 2,500sq.m x 10 floors, 5m high, = 25,000 sq.m, or x 20 floors 2.50m high = 50,000 sq.m
Module C = 5 x 5 = 25 Modules A = 625,000 sq.m / 10 floors or 1,250,000 sq.m / 20 floors
1 Island = 4 Modules C, (or 100 Modules A) = 4 x 625,000 sq.m = 2,500,000 sq.m / 10 fl. , 5,000,000 sq.m / 20 fl.
100K Acres = 404,700,000 sq.m : 2,500,000 sq.m = 162 Islands / 10 fl., 81 Islands / 20 fl.
Palms will need about one year to grow intensively before starting to bear first fruits, so no need of high premises for that period. Growing palms will be placed in 2.50m high halls, while 7-8 and more years palms will be roomed in 5m high halls.
So we'll make an average ratio of 8 floors 2.50m high and 6 floors 5m high.
In that ratio we'll have 14 floors x 2,500sq.m = 35,000sq.m per one Module A.,or 3,500,000sq.m per Island of 100 Modules A (4 Modules C).
Then 100 Islands will make 350,000,000 sq.m or about 86,500 Acres. or 35,000 Hectares.