I got some stuff in a clear plastic tube about 42" long and 3" diameter. Any ideas as for what to make out of it?!?

Could be lots of things. Maybe a large map or drawing, or even a photo. If it's one of these, you could frame it and put it on a wall. If it's something else, perhaps you could post a picture and someone might recognize what that stuff is that was in the tube.

..oh, wait. You mean what could you use the tube for.

Super Scrambler, Super Apogee (II), Super Shrike, Super Icarus, the list goes on and on.

The Super Icarus sounds good. Now, I'll have to get some measurements off the tube to see what parts I need. And how to scale the thing...

The Icarus was a BT-50 so it's roughly a 3X upscale. That would put it at just over 5 ft. tall. Sounds like you might be placing an order for a custom nosecone and bulkhead to Sandman (unless you have a lathe).

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I love sanding.

Yeah, that's the problem. I think this tube is short for an Icarus. So, I can either make a lower engine section or a stubby version...