I hope this is thought provoking
Well good luck for the maiden then
Hi,
If you want to make a low cost model aeroplane then why not make the whole thing from cardboard, hot glue, adhesive tape and popcicle stick.
Here it is done to perfection
how to make a simple rc plane from cardboard
https://www.youtube.com/watch?v=gNKO1RhmkMM
So the actual cost of the model must be under $1.00
The remaining cost is the same for any model you choose :-
Motor
Battery,
ESC
Prop
Servos
Rx.
This could be done under $20, with carriage or a trip to a hobby shop.
I hope that is thought provoking
All the best.
Mal