Hobbyist PV modules work just the same as commercially made - cells are cells and all put out around .5v.
Commercially made modules have an anti-reflective coating (sometimes on the cells, usually on the tempered glass) to help keep photons from bouncing off, which helps efficiency. You won't get that with a hobbyist module unless the coating is on the cells.
The main issue is water/moisture intrusion and longevity because there is no way for a hobbyist to do a proper vacuum epoxy sandwich. I suppose vibration would also be an issue if you are traveling with it.
Commercially made modules are fairly tough. I would think hobbyist panels would be the opposite.
By the time you add the other costs, such as backing, framing, glass and wire, you probably won't save as much as you would think at first glance. Your "cost per watts harvested" (i.e., watts that actually end up in the battery) will likely end up higher than with a commercially made PV module.
I would expect a 72w hobbyist panel to put out around 40w-50w when it's sitting in good sun and running hot. Depending on how it's built - maybe running very hot. And that's if you use glass. If you use Lexan - probably even less.
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