[mus42tang]

Man, if it was easy, it'd be easy.

I'd do some research. You get an unemployed construction worker who's worked with construction foam and an artist.
I'd first do research on the cost. And think construction expense rather than 3D. Especially with 20 targets needing repair.

http://3-dcountry.com/3dweb/?page_id=4

http://www.deertargets.com/pages/archery-targets/target-repair/3d-target-repair

http://archerytargetrepair.com/index.html

http://www.lancasterarchery.com/3d-country-single-target-repair-kit.html

http://www.toolbase.org/Technology-Inventory/walls/latex-foam-sealant

http://www.foam-control.com/construction-products.asp