Well, here is my advice...
There are some excellent books out on the market for designing model aircraft. Just because one chooses to use a turbine for propulsion, the basic concept of airframe design and of course aerodynamics remains the same as that for a propellor driven craft.
I like the book onmodel aircraft design by Andy Lennon, a Canadian, who also wrote a ton of technical stuff for Model Airplane News magazine. I believe it is no longer in print, however, and my copy I bought 15 years ago will remain a favourite. One good book, I just picked up in the last few years, is published by Traplet publishing, and is excellent also, allthough not quite as thorough. Look on the Traplet website to order...
Now, for the meat and potatoes of designing your own craft: for the most part, it depends upon what you are looking for in a plane. For a good sport plane, with moderate top end speed but good aerobatic and low speed flight go with a nice thick symmetrical section, I like 16% or even 18% thickness. As for diherdral, again for good aerobatics a flat wing is totally acceptable. I have built 3 large scale planes of my own design (two large gassers and one a turbine) and all three had no dihedral, ie, perfectly flat wings. With ailerons, you dont need any. If you do want some try 2 or 3 degrees.
I like to start off by designing the wing, ie wingspan and chord, and then the fuse length which then allows calculating the tail surface areas. These formulae are all pretty basic, and in the books I described above.
My advice is just go for it! It isnt as hard as some would have you believe to design your own model and have it fly great. I have done 7 or 8 of my own and if you are following a traditional layout you cant really go "wrong" unless you have something way out of whack.
here is the link to the Traplet book:
https://www.traplet.com/pages/nonmag...&id=31&-search
As far as actual construction goes, it is really dependant upon how much experience you have building kits and such, to know what size materials to use where, etc. Good luck and best of all enjoy the process!
AJC