All good information. Here's some more (at least 2 cents worth
Some of the local 'MAILBOX' houses will pack and ship for you. Of course they charge for it!
The shipping rules seem to change regularly so you should check some shipper's websites for cost of large boxes. Size has a much bigger impact than weight lately and it is becoming prohibitively expensive to ship 'oversize' boxes. That said, the Arrow was not a very big airplane (I can't remember the dimensions of the SUper Arrow, I believe it is just a bit bigger) and may be shipped in a 'regulation' box.
The Greyhound alternative is very viable, though a bit more expensive.

As for the value of that stuff: I'll go out on a limb and say that each kit and engine is worth roughly $150, but that's based on the original prices. Ebay is a great way to sell stuff. The Arrow kits are relatively rare; soooo if there are some 'hungry' bidders out there you may get a surprising amount of money for one or all of your items (I've seen a NIB Hanno Special sell for more than $900 on ebay). I don't think I've seen a Quality Line Arrow kit on Ebay (definitely not in the past 5-6 years) so there is no reference point.

Good Luck however you chose to dispose of some GREAT pattern planes and engines!!