Peter,
Here are a few hasty reference shots. This particular training round was purchased at an auction when I was 11 or 12. Yeah, I've had it a LONG time.
I'll dig out the micrometer and try to get you more precise measurements when possible.
AHA! This exactly what I was hoping someone would find! Thank you for posting this! I confess that I'm also relieved to see that cylindrical dummy weight in the nosecone, insuring that this is a non-explosive training round (M7A1).
The photographs are useful reference, but I really need actual measurements by a human being with the artifact and ruler in-hand. I can't quite get exact numbers from the photos. I should also mentioned that the manual I downloaded has the dimensions of several parts, but the numbers include threads and overlaps--they don't show the lengths as the rocket is assembled.
My request would be that you can lay the assembled rocket down on a table or counter with the nose tip touching a wall or nice square block, with the rocket secured perpendicular to the wall. Then you could measure from the wall. If you use both inches and metric units, it would be a nice double-check.
Don't worry that the nose tip is dented. Just measure from the tip that exists now, and I can figure out a correction to add.
If some of those dimensions are easier to measure point-to-point instead of from the nose tip just indicate the letter for each end of the measurement--say N-J for the length of the outer edge of the fin, or L-K for the length of the narrow part of the nozzle.
Thank you very much for these photos, and especially for your offer to make more precise measurements.
You can post results here, or email me at petealway (at) aol (dot) com
Peter Alway