okay, so you've got your cigar box, and you want to get started on this thing. Your box is probably going to look something like this:
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first thing's first, you're going to have to remove the paper from the cigar box. You can remove all the paper, or all the paper on the inside - I've really only removed all the paper, so I'm going to just remove the paper on the inside. It's not too hard, mostly just time-consuming. I'm going to show the removal of the paper from the inside of my lid, which I've decided to remove, and then glue on, to make it more stable. I just cut it off with my swiss army knife through the paper, any knife will do though
step 1) score the paper with a nail, not too deep, you just want to break the surface to make it permeable to water. I'd show the photo, but you really can't see the detail.
step 2) wet the paper with warm or hot water, it dissolves the glue.
step 3) use an average kitchen scrubby thingy - its an abrasive pad used to help scrub off the more stubborn food on dishes, available at any megamart really. Wet it up and go to town, this is going to take a while, your thumbnail also helps with this process.
the finished product should look something like this:
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okay, we're gonna have to wait a few hours to let this all dry, so I'm going to discuss the process of making some basic plans for the body, as well as the lining of the body.
okay, I'm making a 13 1/2" scale soprano ukulele, the neck meeting the cigar box at the twelfth fret. This makes the whole thing easy to measure - the neck (without headstock) should be 6 3/4" + 1/8" (the width of the nut) - which makes about 6 7/8", plus the headstock. The bridge is going to be 13 1/2" from the fretboard side of the nut, which makes it 6 3/4" from from the neck side of the body.
trace the body on to a piece of paper, decide which side the neck is going to attach to, here there is going to be the neck block - a piece of hardwood about 1"thick by 2" wide, placed in the centre of that side. Next, draw a line parallel to this side, 6 1/2" from this side, this is going to be where the inside edge of the saddle of the bridge is going to be. Next, you're going to draw two lines going diagonally from one corner, to the one across from it - the point at which these two lines meet is dead centre to your ukulele, I like to place my 2" sound hole - drilled into the soundboard with a holesaw - in such a way that the edges come into contact with these lines, it gives you a centred hole, as well as being a reasonable distance from each edge of the soundboard. From here you can figure out where the bracing is going to go. The standard ukulele has two braces on the soundboard: one on each side of the soundhole, as well as a bridge patch. The purpose of the bracing is to add strength to the soundboard, so that it doesn't bend or break under the tension of the strings, without adding too much mass, which ruins tone. The braces should be about a half inch deep, by a quarter inch wide, by however long your soundboard is wide, minus a half inch for the quarter inch lining on either side. The last part to be drawn, is the lining, it is a quarter inch by a quarter inch, and lines the inside of EVERY edge of the box. The nails/staples that they hold the box together with are not strong enough toe hold the uke together, and this provides a gluing surface to hold each piece of the box together.
the neck is going to be explained later, but for now we have a working blueprint for the body. The next thing we need to do is line the box. Make some 1/4" lining for your box out of just about any wood, and glue them to the inside edges, on the neck end, however, only glue in the neck block - it's really all that side is going to need, the finished product will look similar to this:
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except without the paper on the inside, and it will be fully lined.
edit: I've made a TERRIBLE mistake in terms of order, before you line your ukelele, if you want to make a solid wood soundboard, you have to remove the non-lid side of the box. To do so, remove the paper that lines the perimiter of this side, and wedge a putty knife, or butter knife, in between the sides and bottom of the box, you will hit the nails, that's ok, just twist the putty knife, until there's enough space to pull it off the rest of the way with your fingers. THEN you may proceed with the lining of the box.