^The park owns a little North of 600 acres. The plot of land where Son of Beast currently resides is about 12 acres. So really, it doesn't add much to the acreage that the park could expand on. Remember, the main park itself is 364 acres, so it's about half of the available size (double Kings Island, and you have the acreage of Kings Island-- remember, many rides are spread out versus compact-- The Beast takes up 35 acres alone).
How were the trains "iffy"? Are you talking about the ones made specific for the ride, or the ones from The Hurricane at Myrtle Beach Pavilion that were retrofitted to the ride's abnormally wide track gauge? If it's the latter not the former, I'd agree.
To a comment above, you cannot burn pressure treated wood as it emits harmful and deadly chemicals.