so i created a probe clone for my tower d called tower constructor, and his visual is messed up(the actual probe looks like a sphere shape), and i tried removing certain buildings for him, and removing abilities he has, and i need him to fly, so someone help me create this builder unit

You just need to change the model of the Actor, then it will look okay.

i seemed to do somthing wrong when i ended up fixing the model but i made the build structure button cost money somehow, im wondering if its a building now or what...

Did you check to see if you accidentally added a cost to the build ability? Seems mundane, but that's about all that I can think of.