Welcome to the forum. Do you belong to the SCCA or know someone who does? The club has a great online market place for race cars and parts. I can guarantee you that you can buy a B Spec Fiesta race car for considerably less money than you would have to spend in cash and time to "build" an equivalent track use toy. The economics of race car construction to meet the rules structure and end up with a car that will pass technical inspection works in the favor of buying a used car that has a current or at least recent SCCA or NASA log book.
The big downside to the B Spec fiesta and other similar production based race cars is that once you get the expenses calculated out on a spreadsheet the cost of going to a Miata or even a Mustang is not going to take a much bigger bite out of the total budget and give you a much greater level of excitement and satisfaction per event.
Just the addition of a roll cage into a Fiesta adds close to 160 lbs to the weight of the car. Subtract the stock seats and add an aluminum racing seat gives you back some lightness. But, the weight has still been increased and more of it is in the roof thanks to the cage.
I really like my Fiesta's. But, the math and science of using one as a race car or track event toy doesn't compute favorably.
I have just begun looking for parts.
I am not a member of SCCA yet but have raced/time trialed with Eastern Motor Racing Association in the past.
Time trialed a Ford Aspire and a Pinto, raced a Formula V.
I have the car sitting around do to a frozen A/C compressor. I found an A/C delete belt but haven't gotten around ton installing it.
I may do nothing but I have interest in getting back into racing and have a car to work with.
"It is more fun to drive a slow car fast than a fast car slow" to quote someone I don't know.
Before doing anything I would like to talk to someone doing it now or whom has done B Spec.
Thank you for the input, this is the information I am looking for.
I may just upgrade the suspension and time trial again.