From Rapid City via Hwy 44: Drive out on East Highway 44 towards the airport. 1 mile BEFORE (west of) the airport turn-off is Radar Hill Road. Turn left (north) onto Radar Hill Road and go 3/4 mile. On the right side of the road will be an orange & black sign that says Don's Custom Cabinets. Turn into the driveway and go to a big red building with "SHOP" written on it.
FROM I-90: Exit into Box Elder (exit 63 eastbound, exit 67 westbound). Take Radar Hill Road south out of Box Elder for 5.5 miles. The orange & black sign will be on your left (about 3/4 mile after you encounter the stop sign at the top of the hill). Turn into the driveway and look for the big red building with "SHOP" written on it.