One of our favourite custom builds of recent times, check out Peter's Belt-Drive Soma Wolverine for an example build.

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Gates Carbon belt drive compatibile wit IRD Broski sliding dropouts making single speed or geared builds possible
Tange Prestige heat-treated double butted CrMo tube set
Clearance for 700x45c tyres with fenders
Rear hub spacing: 135mm 10mm quick release (can be upgraded to 142mm 12mm thru axle with different inserts)
1-1/8" size headtube
Huge size range
Multiple fork options
Front derailleur clamp: 28.6mm
Rear hub: 135mm spaced, standard QR axle
Seatpost: 27.2mm
Seat collar: 29.8 to 30mm (not included)
Headset: 1-1/8" external cup (SHIS: EC34/28.6 | EC34/30)
Bottom bracket shell: 68mm wide, English threads
Brake compatibility: International Standard Disc mount, 160mm rotors
Chainstay length range: 429-445mm (Please avoid the sliding the wheel to very back of the dropout)

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Soma Wolverine frames are covered by a three year warranty.

Frames