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I made an outline of the P for which was made and used by Antonio Stradivari. I know Addie made templates of the P form as well as many others. His templates where so perfect that he even copied the wear on the recesses for the blocks. So I wanted to make one where these recesses were as "new" while still mainting the outline of the original P form. Also for clamping the blocks/ribs I replaced the holes which where originally used with wooden dowels and ropes as clamps, with something more modern which are rounded rectangular "holes". In my opinion the latter are more convenient for use with g or f clamps. The pdf size is A3. But you can also print it in two A4 papers. There are online websites which split an a3 pdf into two a4. Just if you take this approach make sure that your printer supports borderless printing. Also for both methods you should disable any scaling or fit to page options, as that could potentially alter the dimensions of the form, when printed. The dimensions used to scale the p form and to make the actual template are from ‘Stradivari’ by Stewart Pollens. In a few weeks I will do the same process to make the templates for the g and the pg form as well as a few scrolls. FYI i used Fusion 360 and despite the fact that its a powerful software it still has its limitations. Not only that, but also the images used to make the outline could be distorted blurred etc. These are some of the reasons why my outline could be slightly different than the original p form. I tried to be as precise as possible, but do note that there probably is some slight deviation from the original and there will always be when working from pictures Anyway I hope you find my template useful here's a dropbox link to the pdf https://www.dropbox.com/s/5v8csuh4to1axo7/Maestronet P forma.pdf?dl=0 and here's a rendering of the 3d model of this form.
Over the last couple of years I have extensively studied Stradivari's guitars, guitar forms and templates and guitar making methods, to come to a more close reconstruction. The large guitar was made after Cremona template MS. 750. The small guitar was made after the little form in Paris (E.901.6). The cases were based on the "Giustiniani" example. These were the first guitars ever made after the Stradivari forms and templates, instead simply making a shortened version of the "Hill" or copy a guitar with later alterations (Rawlings). An article about this investigation, along with a plan for the little guitar, was published in the summer edition of American Lutherie. A shortened excerpt of this article can be found here: https://thedutchluthier.wordpress.com/2015/08/30/antonio-stradivari-guitar-maker/