BOM

Shuttle

X6 3x8x3 MR83zz bearings.
X6 M3x8 buttonhead screws, m3 washers and heatset inserts.
6x3mm round magnet

Shuttle - Pads version

X6 3x10x4 623 Bearings. Can also use the flanged version form regular Voron BOM.
X6 M3x10 buttonhead screws, m3 washers and heatset inserts.
6x3mm round magnet

Toolhead mount plate

OptoTap sensor - needed for the Toolhead 0, optional for the others
2x m3x4 button head screws to mount the sensor
6x3 round magnet
2x m3x8 SHCS screws - for tension adjustment
some glue to hold the rods/pads in place, PVA glue works well as a start
some heatset inserts

Depending on which version you are building you will also need:

Pads version: 4x steel pads - 10x4mmx1.5mm, im cutting them from a stock piece from local hw store
Rods version: 2x 3mm steel rod, 26mm long
Square Rods version: 2x 3x3mm square steel rod, 26mm long, aliexpress has them.