Recommend checking out BCPOV trail build videos. He does nice work with polycam to scan, and jigspace for the augmented reality with an iPhone 12 max. Watch this or skip to around 11:15 to see what I mean.
Meant to add that as for the trail itself you can do that on any number of mapping websites. I'm most comfortable with CalTopo. It's free unless you want to unlock more features and there may be better options. You find your location, select your map style and add the lines to represent your trail. Then you can view the elevation profile and adjust the trail location to suit.
Thanks Ben, some good leads there. I am looking more for a landscaping design style to create birds eye view diagrams when designing things like skills parks and submitting applications to towns etc. Thanks for pointijng me in the direction of the things that BCPOV uses though, I wondered what that was.