yea I hear you, my daughter is doing about the same thing as well
That sounds pretty cool, and a chance to be really creative working and building customs gates, I know that there is a lot of request for them when times are good, but when times are bad you do what you have to.
I have been in the off-road industry for about ten years now and it has been one big learning experience, I did not know anything when I started out, but having been able to work for some higher end shops building sand cars and pre-runners I have been able to pick up a few things here and there and overall a pretty cool experience.
If you would like you can send me over some of the spindle specs that you are trying to figure out and I would be able to see if I could figure something out for you are at least get you going in the right direction and at that point you would have a CAD rendering of the new spindle design.