Well .... its been a while and thought I better post on up an update ....
Things have gone surprisingly smoothly with this build. ***touches wood***
I mused for ages on a post. It seems that I am too heavy for the real weenie stuff that seems to have a maximum rider weight of 85kg
After a bit of investigation it seemed that a fair few posts are around the 230g mark - not lightweight but lightweight enough. That said many were 350mm.
I plumped for a 410mm Thomson and was surprised that it weighed 236g - I have some Ti bolts that I plan on using and may cut a few CM off of the bottom - 200g may be possible without going crazy.
So I still need:
34T Renthal ring (35g)
160mm KCNC rotor (73g) but replaces the 130g Magura on the front
I have a load of Ti bolts that should save a bit
but apart from that she is done for now.
I would like it if the build ended up being sub 21lb.
As stuff wears or I sell on bits I will look for lighter bits - looking at carbon rigid forks - nearly two lbs could be lost from the Reba Team fork