Deled is a simple 3D editor so it has none of the uneeded bloat that other 3D editors have(It also exports as *.x which is great for B3D)
Not Patreon, Discord ;)
39? I turn 43 soon so we are similar age :P
One of the things with a 3D editor like deled or blender is that the exported level is one solid mesh so I have no control of extras like plants and grass(plants can be picked up for instance) my own tool just cuts out the work of placing things by hand(I could walk around in game and write down the co-ords and then place them in code but this is easier in the long run)
Top down GTA should be no problem in Blitz3D just need the time and dedication to pull it off.
Anyway add me on Discord or Twitter(Grindalf_games) and anytime you have a B3D related question I will be happy to help :)