1: Yes, but you may not like it, using photo-editing software may be easier. Check out the
2000 stone trick. You could potentially use it to stamp the farm tiles in place and then raise them. Additionally, you could try magically erasing farms, but that would be tedious and I don't know if it would actually solve your problem. You might also consider just making "farms" out of shrubs if it's just for appearance purposes.
2: Not that I'm aware of.
3: Not that I know of.
4: No.
Have you considered building up what you want in Minecraft and then using Overviewer? It generates a nice isometric view of a given Minecraft world.
-DOOMBRINGER-
"DOOMBRINGER, make a parking space IMMEDIATELY!"
"DOOMBRINGER declares it to be SO!"
"DOOMBRINGER, I command you to lay siege to THE ISS!"[This message has been edited by Timballisto (edited 05-11-2019 @ 09:26 PM).]