The rugged frame, drum brakes, basic suspension, and large, manual gear shift is a big contrast to today's bikes.
I grew up with these bikes, left by the US army in the jungle of New-Guinea after WW-II. They were re-assembled and restored by our family and friends. Magnificent machines. Your drawing made me think back of them.
Nice, this looks like the bike Lourance of Arabia wrode (might not have spelt that right)
Sweet job!!!