Your plug has some cutouts for leading edge of wing??? If you make cowl full depth you can relieve it to clear the wing after a part is pulled from mold. Do you have a drawing for the parts you need? You may need to make multiple and or split molds. Hope this info is helpful.
I understood first part of your reply but this above is sorta going above me....lol
Pls explain it again, cowl Vs LE of the wing.....hmmm
This cowl goes on the nacelle, so where does wing comes in between....
Well what you see in the pics above parts are what i need to make copies off, yes i do have drawing of actual aircraft's cowls but why those for..
Yes this main cowl's body will be molded in split sections no doubt about it, that i know and i also know how i would split the sections of it to make separate molds. Now this dosen't mean by cutting the plug at all, i meant by placing parting boards.