toothless is pretty close to what you're after.
They're very individual things though, so copying pan/boom measurements exactly isn't really a good idea.
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It's "skate or die" not "skate and die"—Wear a helmet, use what's in it.
Don't forget to measure the weight when you are laying down on the luge and not for the luge only
About the weight balance I would like to mention the golden ratio, which seems to work very well.
Another thing: measure the weight balance, when you simulate a slight turn by lifting your upper body a little bit, because for going straight, it is not so important how your wheels are loaded.
Make sure, that you leave a few inches in your design before and behind your rear trucks, to correct the weight ratio for your riding style, which you can only find out while riding.
(Steve, one scale will also work. Place it under the front truck and a book under the rear truck and vice versa.)
Rofl, that complicates things significantly.
So when i put on the back truck, have it in the middle so that i would be able to adjust it closer to me or farther away from me?