The cuban site
www.cuban-christmas.com you menitioned above shows how to do it the right way if you dont have a big enough smoker.
Instead of using cement blocks, one cuban guy I know here in Florida made a cuban pig roastbox out of sheets of aluminum with piano hinges on all the 4 corners of the box so it could be folded up. He cut slots for the handles of the frame/mesh (grill) on the ends of the box so that they could just slide the whole thing down.
When you roast in this manner, make sure the charcoal and wood are on the sides and not in the middle so the grease doesnt drip right on the fire and cause a flare up or out and out grease fire. Also the whole point of the grill frame and handles is so that the pig can be flipped.
As a courtesy for your more genteel guests who may be squeamish I wouldnt serve the pig with the feet and head. But if everyone has participated before then just leave them all on.
Nothing like roast pig with a good Mojo sauce. I use Mojo on a lot of things including chicken and grilled fish (like Dorado "Mahi Mahi")
PrestonD