I have decided to build a Delta similar to a Diamond Dust. My goal is to make it a very clean and fast aircraft by having a slightly raised center section to keep things like the fuel tank and servos out of the air stream. I also have some ideas for an engine cowl. To give it a little different look I angled the trailing edge corners. My question is will these angled corners create more drag then a 90* corner? Will the tip cord marked be satisfactory for figuring the CG?

I plan on staying as close to a NACA 0006 airfoil as the size permits with a fairly sharp leading edge. One person I know did put a sharp leading edge on a Dust and did not experience the nasty accelerated stalls like many get with the Shrike. Any thoughts on sharp leading edges on a Delta?

Thanks