Shawn,
Welcome to Trike Talk! It sounds like you are at the "How high is up?" portion of your project planning.
Things to consider:
1. How soon do you want to ride? Fabrication can take literally YEARS.
2. Is this a fabrication project or a "get your knees in the breeze" project? Don't be lulled into the 6 figure custom fabrications in less than a hour (less commercial time) as seen on TV.
3. Can you weld? Your life, and those of others will depend on this!
4. Are you a machinist (professional or hobbyist) or do you have access to machine shop services? There are ALWAYS custom parts required!!
5. Do you have heat and AC in your garage? Creature comforts make it easier to continue a seemingly never ending project in the winter and heat of summer.
6. Get familiar with your state's DMV laws and regulations especially where it pertains to "Special Construction" or "Home built" vehicles.
Once you can check these points off, wander about the Forum and read the different build threads. Lots of good ideas here. Google is your friend. Search Trike images and follow the rabbit holes linked to the images. This often leads to obscure build threads. Search Google overseas also. Lots of interesting approaches in the UK and OZ (Australia). Brazil is a good source of ideas too. Google Translate helps here!
I'm working on a tight budget and I started 20 years ago collecting parts. Started the build several years ago and got put on hold for 2 years because "Life gets in the way." and my in ability to locate an obscure VW trans tool / assistance to set up my trans axle.
I would recommend developing several different approaches and develop loose build plans before you start acquiring parts, then keep scouring ebay, CL, Marketplace, etc. for parts. I got a complete CSC fiberglass body for $150 but had to do a 600 mile round trip to pick it up.
Your build can be as complex or simple as you want it to be. Ian Roussel built a basic bar hopper trike that is pretty straightforward.
https://www.imdb.com/title/tt8028284/ No rear suspension ala early HD Servicars.
Good luck and don't get discouraged.