What I did regarding my wooden bucks for metalshaping-
Making the egg crate wooden bucks, especially for the tank on my Moto Guzzi Corsa Record (see build thread under Motorcycles https://ce8df029be3e-004671.vbulleti...page4#post3266 ), worked well for me. If you're not going CAD/scan/cnc/water jet where component fitment is largely guaranteed, the approach I used on the tank buck is much more practical and forgiving than the 100% notched or cut dado fitment. Producing dadoes by adding spacers to the face of a panel is quite simple to get right. It also allows a means to separate portions of the assembled buck. I'm anxious to do more metalwork on that project more but other responsibilities have priority for the foreseeable future.
It's challenging to shape a station very well and then properly saw one or both of the notches. On the larger spine, numerous cuts all have to be done properly. Lots of opportunity for error. It's great practice if you like to practice accurate bandsaw work like I do but not as $billable labor$ practical if you're not good with the equipment and layout protocol. My seat and fender bucks were sawed with notches. All fit is very good to excellent without any bad pieces. An accurate table saw and accurate bandsaw are a must. A large belt sander is very helpful as well, if not necessary. You can do the work without these tools, but it will go slower. A hand held saber saw is fine for approximate rough cuts but the blade can easily deflect from vertical so cannot be trusted. Use a router instead of a saber saw. After any saber saw work, a band saw will provide much better accuracy. Glue is stronger than wood. I glued and screwed the dado spacers in place, but only screwed the individual stations so they could be moved, removed or replaced. I had not seen the fabricated dado method I used in any book but cannot imagine I was the first to do it. I have plywood dimensioned dado bits for my router but its faster and cheaper to fine tune a new spacer than recut a large piece because i routed the 18th of 20 dadoes wrong.... I had also not seen a bike tank buck done to split in half along the centerline so the tank tunnel shape could also be produced & used. It's simple and practical imho.
If I was building a car buck, I would do the same thing (for example) along a front fender centerline and other centerlines. Use T-nuts and bolts, alternating from each side, to attach the various pieces creating these centerlines together. The extra material used will produce a heavier buck but allows you to keep these centerlines perfect.
Page 3 of my build thread shows the tank buck pics I can't find on my computer, with halves separated after I corrected the buck. These are pics of the initial buck development in plywood. hope this helps.
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