overkill nah, its Cervelo quality for Ribble/On One money (Scott and Cervelo made in same factory) so why not?! If I hadnt recently bought a heavily reduced carbon/ultegra Lapierre in a CRC sale I’d be all over this like a shot; get a reduced groupset from mail-order-house-of-choice and you’re on your way to building a quality new bike for less than it would go for used which is whats known as a no-brainer.
Specs say its comes with Ritchey WCS headset fitted which is ~£50.
I’m a recent and huge convert to road, the ability to get out for an hour or three straight from my door fits in with shift work far better than loading up the car and driving 40 minutes to ride, and Ive discovered a joy in riding UP hill. Only problem is getting on my ~35lb 160mm full susser after 3 months of 18lb road bike and it feeling like a lead-filled mattress!
have fun with the build and stick a pic up when its finished.