There was someone on here that commented before that the pad will be really slippery when wet if you do plan to use it as a parking pad.
Depending on size, I think your estimate for building the garage on the finished pad is way too high. You could likely build a shell, put siding up and your door on for less than $10K (for a 24' x 24'). That way you could still use it but finish thr inside later.
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