Yep, it's pretty easy to scrape the pans, especially when lowered. But I have even done so on my stock 318, so that's no guarantee of oil pan safety.
There are a few good skid plates out there for the M42, the only one I have seen in person is the raceskids one which is a bit over $200 shipped IIRC, looked like a quality product too. If you really want to pay shipping and handling I can send you a set of stock springs, but you should be able to get some locally for peanuts/free.