The Remodeler's Guide to Making and Managing Money by Linda Case (Remodeling Consulting Services, 1996; 301/588- 8172). Paperback, 6x9, 140 pages. $25. When Linda Case asks remodelers how healthy their businesses are, most will show her a positive checkbook balance and smile confidently. But this is one of the worst ways to monitor a business, according to Case. She likens it to flying a passenger jet stripped of all its instrumentation and relying instead on just one big red light on the dashboard. If the light starts flashing, the plane is at 1,000 feet and falling fast. If you'd like to increase the number of ways your business can signal you, get a copy of Case's new book, The Remodeler's Guide to Making