Alpha upscale nose cones?

[UPscaler]

I'm planning on a 4x alpha in the new future. I can't find anyone that has the right size nose cone. For now I have been substituting the PML 3.9 inch plastic cone.

 

[MarkII]

A couple of options, one for wood and one for fiberglass:

https://roachwerksmachining.com.istemp.com/

https://www.scotglas.com/
(click on "Components" at the bottom of the page for a representative listing)

MarkII