14 oz/sqft is light, but typical of deltas, there is no fuselage, tailplanes etc. I fly a 48" '362' delta which is well powered with an old OS .40, and it weighs around 4lb for a similar loading to your calculation. You need to know that in order to use the very high (=slow)landing attitudes possible the prop needs to be at the front. The top speed will be much better than you would expect, due to the low loadings, and the low drag at the very low AOA needed to fly. If you start doing 'high alpha' stuff the drag rise is a bit higher than with the normal layout, and you need to carefully transition to normal flight in order not lose altitude, but the speed range and acceleration is a bit better than normal stuff. Balance around 50% centre chord, and mainwheels just behind the balance point, helps both takeoff and landing. Other than that the usual stuff applies, keep it light and have fun.
Evan, WB #12.