UKIE,

Before you scale up a plan, look it over carefully to see if it has all the things you need. For example, if it is a built up fuselage, does the plan include the shape of the formers or just where to place them. Same with the wing, do they only provide a top view or does it include rib shapes.

If the design uses a tapered wing, you need at least the root and tip rib shapes. Some plans show each rib.

Some designs have only an isometric view to assist assembly but discourage producing your own kit. If you get one of these, make a tracing of ALL of the parts in case you crash and have to reproduce them.

Sometimes it is better to purchase plans from someone who has reproduced the plan in full size. A lot of work goes into some of them.

Good luck,

George