Yes the vinyl sticker is a home printing thing. A 55 pack of 8.5x11 is $21 on Amazon.
First practice with plain/scratch paper until you get the print settings correct.
I imported the plans into Inkscape.
In Inkscape, you have to designate the page size for a PDF export.
I created an 1000mm page height and then sized the plans until the wingspan matched the height of the paper.
I then duplicated the plans about 8-10 times in the Inkscape work area.
This allowed me to cut out each piece individually.
I then created a standard size (8.5x11) PDF page and drug all the smaller pieces onto it.
The smaller stuff that I could fit fit onto 1 page was easy.
Slightly large stuff (2 pages) I cut myself that way I could control where the seam was.
For the the fuselage (10 sheets) and wing (12 sheets), I created a PDF that was just large enough to fit them on and then exported them.
There are several YouTube videos on how to do this with plane plans.
Once printed and placed onto the DTFB, I gave them 2 light coats of clear spray enamel.
The vinyl stickers are supposed to be waterproof but I wanted a little extra insurance.
Another option would be to size it to match a commercially available plane that way you may be able to their use parts for that.
The fuselage is pretty strong as is from the folding technique so I didn't add any internal formers and I am still a fairly new/gentle flyer.
If you want to go crazy with it, you can add a few formers in there. The wing is stout with the spars I created.
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Still trying to get the maiden in as it has been quite windy here at Vandenberg SFB lately