Profile Magnutanium length

[SEMPER_UNI]

I've had a sun doublewide rim sitting in my bedroom with a 3" Gazz on it for about six months. the problem is there's nothing inside of it.

I've determined that'll I'll be using 132mm black spokes and aluminum nipples.

I've also determined that i'll be using a profile hub (this determination was the driving factor in above stated determined spoke length).

I'm planning on ordering 160mm Profile crank arms, but not just any crank arms, i'm thinking about getting the stupid light "magnutanium" mini bmx arms. don't let the name fool you, there is niether magnesium or titanium involved in the construction of these crank arms. 100% pure 4140 chromollybedenum. they are just made of thinner walls.

wondering the opinions on the crank length and lightwieght construction. i know it is very rare, although i've seen pictures, for anyone to break a profile crank arm, so i'm thinking i'll try the lighter ones.

most of my muniing will be light, no "huge" drops. i'm a biketrials and unitrials rider, so i'm pretty smooth with my drops anyway. I think most of my muniing will be on fast, moderatly technical michigan trails. nothing to extreme for now.

my legs are plenty strong, i can squat like the governor of california, so leverage issues aren't a huge concern. could i go even shorter than the 160's?

Thanks for any input.