don't forget that wheels and tires will be key to success also Minimum 32 hole (36 better) quality rims on quality hubs, double butted stainless spokes from recognized brand. High end supple tires
I would get an experienced builder to do the design for you. Where are you located? that may help people recommend someone close. My buildier was 1300 miles away, but has the remote customer process solid
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Life is too short not to ride the best bike you have, as much as you can.