Tom,
The short answer is yes. You can laminate blocks until you get the size you need. I have cut and pasted an exerpt from the NVCL Musciano Rules. Since we were the first group to do this, most everyone follows these same rules.
Section 3 of both the Acceptable Designs section and the Aircraft Requirements section should give you the answer.
"ACCEPTABLE DESIGNS:
1. Must be 1/2A (.049) control line planes designed by Musciano and kitted by Scientific. It does not need to be built from the kit however. A list of permissible planes (permissible to the best of our understanding) will be published separate from these rules. However, being on this list does not exempt them from satisfying any of the requirements listed in these rules.
2. Either single or twin-engine models are permissible.
3. Only carved fuselage planes are permissible. No profiles. No built up from sheeting and bulkheads.
4. Only planes with solid wings are permissible. This also means exposed controls only; not embedded or enclosed controls.
AIRCRAFT REQUIREMENTS:
In addition to the General specifications:
1. Planes are to be built per the plans except as permitted otherwise in these rules.
2. The size, outline, placement, and areas of the original are to be maintained. This includes the Wing, Stab, Elevator, Rudder, Fin, Fuselage Side and Top views, etc. Cowls (or landing gear), if included on the plans, may be left off; but will be not be scored as high in the Appearance and Craftsmanship event as the same plane with a cowl (or landing gear) that is otherwise equal. Cowls (and landing gear) may be made removable and left off in the flying events and doing so will not forfeit Appearance and Craftsmanship placement awarded while they were in place for Appearance and Craftsmanship
3. The fuselage must be carved from a block, or constructed of glued and carved slabs — no sheet and bulkhead or stick and tissue substitutions. Rounding and shaping of the fuselage must match original
4. Wing outlines must be maintained; the construction must be of solid wood; however, the airfoil is at the builder's discretion.
5. Modern control systems, hinges, and adjustable leadouts are permitted.
6. Finish and markings are at the builder's discretion. Colorful, elaborate, multi-color, finishes are encouraged. "
Hope this answers your question.
Take care,
Ron