There are many commercial jet aircraft with these strange shaped wingroots, but the reasons for the shapes has more to do with wing/body blending and actual airflow patterns around these areas of the airframe. The shapes are optimised for minimum drag at cruise speeds and attitudes, with sufficient depth for the spars and fuel tanks. Unfortunately, using them in model situations will not result in similar results, models simply do not fly fast enough or have enough volume for these shapes to work. Although you may not like it, for maximum efficiency you will have to stick with typical model sections.
Evan WB #12.