Hi guys
For a while ago I started a 1/6.5 scale mq9 reaper scratch build project
with 1/6.5 scale I'm going to have a Reaper with 309cm wing span and a fuselage a shade shorter than 1700mm (including the spinner)

Without thinking a lot at the start of the project I just went ahead and chose epler374 for both root and tip wing airfoils,
Then I found Mark Drela's design on apogee and suddenly became very unsure about my choice of airfoil!
So after putting many hours on auto cad and designing the wing I went back to square one and started asking myself is epler374 really a good choice?
I did a little research and found a thread about a Predator project here.
in that thread Mark suggested to use the SD7032 for root and the SD7037 for the tip of the wing. I thought Predator is the little brother for the Reaper I could probably use the same airfoil for my project
The problem is when I look at my auto cad design I need a root which is around 48-50mm thick to be able to get a scale look for my machine and by looking at SD7032 in an online airfoil plotter for a chord of 280mm and at 100% thickness the airfoil is around 30 mm at is thickest section.
I'm not an aerodynamic guy at all so can you please tell me if I increase the thickness of the root airfoil to lets say 150%-160% to get the thickness I want (just for the sake of look) what kind of side effekt I get?
I know for sure I will have more drag but what else?
Is there any other airfoil you could suggest for this project and this scale?

Thank you