Yeah, there is, though it's not particularly easy. This webpage has a good guide. In fact, that whole site is worth a look. Tofu, you may want to consider making a less complicated shield (called scutum, p. scuta). Check out some of the designs on this site. I specifically suggest one of the flat designs rather than the curved ones, since the curved ones will require another whole process of construction. On the other hand, the flat designs are essentially--and for all intents and purposes--pieces of plywood covered in linen and painted over. That first link I provided will tell you how to build the grade-A best, most accurate version, but let me say something: despite all my ranting about accuracy and such, I doubt I'll be making one that accurate. Looks authentic is close enough for me. I really don't want to delve into the whether one should use milk paint or latex, much less which brand of milk paint is "more accurate" than the next. If you're interested, Tofu, and if some other members are, make a new thread and I can give you some guidance and descriptions on the various types of shields, as well as their eras and paint designs, along with anything else. Otherwise, just email or Facebook me.