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@gizmond
You need to work out your trail. HT angle and Fork rake are linked for a given type of handling.
You want a trail of around 58-62mm for 'track handling'.
So, if you are set on a 15mm rake (where did you find one of those) then you need a HT angle of about 77 or 77.5
A 74 HT with a 15mm fork would be un-ridable, trail in the 80mm region, like trying to steer a shopping trolly
TBH it doesn't sound like you should be designing your own frame? Perhaps talk to whoever is building it about what you want, and let them figure out the geo?