Often times at first glance a board looks straight and the fact that it is actually bowed or has some warping isn’t always obvious. So the trick to knowing for sure, is to hold the board up towards your face, with the other end on the ground, and look at it at a downward angle (as shown in the below photo). This method will allow you to see if it is bowing at all.
In many workshops, band saws and drill presses are not used constantly, so they can be set back out of the way. Jointers and shapers can also sometimes be set back out of the midway, but keep in mind that the more trouble they are to reposition, the less useful they’ll be. Remember, too, that while jointers and shapers take up relatively little floor space, you need to allow space on either side that is at least the length of your longest workpiece: a four-foot workpiece needs about a ten-foot space (the tool, plus four feet on either side). The longer the pieces to be joined or shaped, the greater the space required on either side.
These are all good tips, and apply to pretty much every shop. Like all things woodworking they need to be tweaked so that it’s right for the individual. For instance, I have a basement shop that’s not tiny but it is still space constrained, so worrying about the optimal layout for my ts/jointer/planer is a little off the mark since I don’t have to walk very far; instead, I want to be sure that related tools can be used *at the same time*. Having to move the planer out of the away so that I can use my TS is crazy if it can be avoided. However, interference between my drill press and my planer is less of an issue because they usually don’t get used at the same phase of a project.
Let’s be clear about one thing: No workshop is perfect for everyone. If there were, I could simply give you a precise plan to follow with clear dimensions. Every person who comes to the hobby, avocation, or profession of woodworking has his own particular collection of tools and his own peculiar work style, skills, and desires for the kind of woodworking he wants to do that gives him a unique approach as to how he will lay out a shop: where the tools should go, where lumber and supplies are stored, and how much bench area he needs.