William H. Whyte certainly opened up heads to design principals - I think you can go a few steps further even with time and intuition. keep breathing fresh air and making as many clean and relaxing spaces as you possible can. There will never be enough.
I am very interested in roof top development as green spaces in urban areas too. They seem to becoming increasingly popular thank goodness but there is sure space for a whole lot more.
Keep up the good work and keep us updated on your steempark!
Have a beautiful day!