Some creative materials - isn't Tungsten almost black and really heavy? One of the reason why in the last run Titanium was so expensive is because it's so hard to machine - so Tungsten is probably multiple time more then TI...
We still need to do some tests with Alluminum - but I think the next cpf run we'll probably offer Alluminum (123), Stainless (123), Stainless (PILA). I'll email the details for sign up to everyone who sent me an email to mobile1 at gmx .ch - in the next couple of days. (I'll send the email to everyone in the first run as well).
Regarding the Titanium versions - we need to get some quotes for that - but it's likely to be in the $400 range (sorry but the price of TI went through the roof with the war and Boeing and Airbus needing lots of it for their large jets (according to McGizmo))
Regarding optical rods - would love such an idea, but they wouldn't be strong enough. Especially for the PILA version, we probably can't even use Alluminum for the PILA.