A plane that weighs 16 pounds and has 1390 squares will give ya about 26.5 oz/ft wingloading.

A plane with 1600 squares and weighs 17 pounds will give ya about 24.5 oz/ft wingloading.

The BME Yak is a popular 3D model and it has about 1450 squares. Projected weight is 16.5 pounds on the high end. That works out to about 26oz/ft.

Aerobatic planes can fly with wingloading numbers up in the 30's but for 3D, I think you want it as much under 28 as you can get.

Consider a standard trainer (Sig LT-40) has about 16oz/ft wingloading. If you could get a large scale aerobatic plane down to 16oz/ft--you'd be in 3D heaven.