Lugs generally have some room for variance in angles.

I don't know your frame building skill set, but I think some concern should be about whipping out a frame, and taking it out and racing on it. Potential for hurting yourself/ others. There are countless mistakes a first-time builder can potentially make. I have been building for many years. Not trying to be snobby but even good builders make mistakes on their first attempts. I also recommend not building your own fork--a major liability.