What is a short kit? 
Hi Liner (don't know your name),
The term short kit goes back along way. It was used on simple f/f models with print wood, balsa sticks, and plan wrapped in paper tube. The Force series of short kits contain the needed laser cut balsa & plywood parts to build the model. Stick wood, sheeting, hardware are not included. However, it suggests the right hardware that is needed and the proper size of all balsa. Weight of the balsa is not suggested but every one knows that the lighter wood is better except for wing spars they should be medium weight balsa.
One of the reason I prefer short kits (over factory produced kits) is I want to choose the hardware it want. Example: landing gear wire or aluminum sheet gear. There is nothing wrong with music wire landing gear. For some it is easier to bend the wire gear than the aluminum sheet gear. Another example is type of pushrod, some like the music wire and others us c/f pushrods and so on. So why pay the money for something your not going to use, you could always put in your scrap box and save it for another time.
If I put all the need parts, landing gear, sheeting, c/f pushrod, sheeting, and stick wood the cost of the kit would go up a fair amount, and that would reduce the number of customers that would be able to afford the cost of the kit.
Later,
Mikey
I didn't mention the Primary Force also comes with an instruction book with step by step instructions.