Frame purchase advice needed

I am considering building my own for my next bike. I want (another) road bike but I need to know about frames before I purchase one. I was thinking of a more relaxed geometry (being nearly 60) and the ability to fit mudguards. What would comprise relaxed geometry and how do I know if the frame would have sufficient clearance for mudguards?
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Depending on budget, many bikes that are not aimed at racers will have mudguard eyelets for attaching them. If not, something like Race Blades are easy installs for tight clearances. As for recommendations it would probably be good to know a budget?