ornamental ducks

So, I am pondering building an approximately 180sq ft aviary primarily to house 4-6 ornamental ducks, ring teal, Mandarin possibly wood duck. I intend it to have several small ponds, a mulberry tree, ornamental grasses and other plants.... I (while Im hearing*not recommended*) am wondering, are...

I have 3 Mandarin ducks that hatched in May 2021 (1 White Drake, 1 Normal Drake, 1 White Hen) I also have About 30 Mandarin eggs that are hatching, 5 Have hatched so far, And I will be able to sell any that I have by this fall. I am Expecting to have around 20 Mandarin Ducks to Sell this fall...