Next mod is a carbon rigid fork
Nice looking build. Which forks are you looking at? I was split between the Niner Boost RDO MTB fork (490mm axle to crown, 585 grams) and the Salsa Firestarter 110 Deluxe carbon fork (483mm axle to crown, 787 grams). The stock Chisel expert has a 506mm axle to crown length.
I settled on the Salsa fork but have some regrets. The availability of the Salsa fork and the "out of stock" status of the Niner fork was a deciding factor. The Niner fork is in stock now and I haven't mounted the Salsa fork yet but decided to stick with the Salsa fork.
The light mount, internal dynamo cable routing, and bottle mounts sold me on it. Those extra features won't get used too much but are worth it to me. I'm planning to ride the GDMBR this summer and think the Niner fork is probably a better choice for most people generally and on the GDMBR. It's just that I'm really into the light mount because I've got huge hands and limited space on my handlebars. This is a fairly unique issue as this applies to when I'm using a handlebar harness, Garmin Etrex 20x mounted, inboard bar ends (mini aero bars), and feed bags. The 4 sets of 3-pack bottle cage mounts are meme worthy and have extremely limited application but I'm sure I'll appreciate them on the occasions I use them. They won't be used on the GDMBR. I've got three King Cage Manything cages and a few route scouting trips planned for that.
The Niner fork has two mounts for regular water bottle cages, no dynamo cable routing, and no light mount. I haven't weighed it to verify the weight.
I weighed the Salsa fork and bolts and separately weighed the bottle cage bolts and they add up to 40 grams of the weight.
edit:
Included the axle to crown measurements. Worth considering.