Kinkos is one way around the problem if you REALLY need the whole plan reduced. But since you already have the plan for reference you only really need the parts of the plan that are needed for building the smaller version over and for cutting out parts. For that a simple reduction capable photo copier will work. For example the wing can be printed on just one strip of pages and if you can use 8.5 x 14 legal size in the photocopier you'll only need 3 of them joined end to end. That's one sub plan. The fuselage can be one more strip of 2 or 3 pages and the tail feathers on one each. Parts can be reduced on a number of separate ones that don't need any joining at all. This is how you would want to do it anyway. Photocopiers pretty much always introduce a little distortion of some form and by minimizing the number of joints you can get pretty good results.

Now for another issue. 1/2 size is going to give you a 30.5 inch span and only 170 sq inches. With any of the 049's to 061's that's going to be a real hotrod of a model. You'd be far better off scaling to 0.6 for a span of 36.6. That would give you a wing area of 245 which is still a sporty but not crazy size of model. If you're thinking trainer speeds still then I'd suggest a 40 inch/60inch size ratio for a 40 inch span and area if 296 sq inches. With the Norvel 061 that would be a nice size that would do some stunts at full throttle and full control throws yet it would also slow down nicely for training and landings. Either the 061 or the new AME or Norvel 049's or the older Cox engines will work fine in the 36 inch size. The Norvel option has the advantage of coming with a throttle unless you're lucky enough to find one of the Cox engines with the throttle sleeve on it.

To get the best out of this size of model you're going to want to get a second airborne radio flightpack that uses smaller servos and battery pack then the stuff in the big Tiger. The 36 inch and 40 inch Tiger Cub options will both fly better if the weight can be kept to 16 to 18 oz for the 36 and 19 to 22 for the 40 incher. With the 1/2A stuff it's not really the size that matters within reason but the overall weight the engine has to lift. Then again for pleasent trainer like performance a low wing loading really helps. The lighter it is the more aerobatic as well for later when you increase the control throws. The servos and stuff do not need to be the super small new parkflyer stuff. Mid size servos like the Hitec HS81 or the slightly smaller HS55 or HS60 will work fine. In fact for this size model and depending on the speeds the truly micro stuff may not have the torque needed for the workload. Lots of us here use the 81's with excellent results. They are tough enough to handle a bit of rough handling and survive crashing better, are only slightly heavier than the lighter suitable alternatives and yet are WAY lighter and smaller than the standard size options. For a battery pack either 200 to 270 mah nicads or 400mah NiMH packs are light, compact yet let you get in a good 6 to 8 flights during a day.