I've seen a guy on HT use 1:32 (or in this case I believe 1:48) parts in 1:18 applications. I figure something like a 1:32 MIM-23 Hawk missile would look believable hanging on the hardpoints of a Huey or MD 500. It's an option other than a Hasbro MMS, anyhow. Maybe a small scale kit of a honking big ICBM or SCUD could work too.
Oh hey dude, PM me your address so I can figure in the right shipping for this VAMP. I'm trying to run by the PO Saturday (got held up this week by being busy at work, and the site crash threw me all off) to get a quote on the shipping rate, so I can let you confirm before shipping it on Sun/Mon at the latest.