No these are from before laptop days. Also most laptops do not us scsi drives and do not have the security features these boat anchors had.
How old are these things? I once had an old powerbook 520, circa 1994. I'm pretty sure that had a SCSI. Not considering the computing disadvantage that laptops had back in the day, but I would hope that they didn't stick with those awkward machines mounted to their dashboards for too long.
Oh, and by security features, do you mean too large and heavy to easily run away with? Or maybe the security feature that any potential thief would take one look at it and go, "WTF is that?" and keep walking.

Overall, I think it would be kinda cool having some sort of PC like that for a LAN party, as long as the PC is up to date.