1. "[quote=E-Z;147405]you say top half then bottom half using the polyline
not sure why you didnt say draw a polyline around the guitar body out line
do you mean front and back?"
Not front & back, top and bottom edge of front face, your way makes a big n-gon.
2."you say
(Then connect the two using the ruled surface tool)
so you saying to connect the upper half and lower half polyline upper and lower
or front and back
"
Not front and back, top and bottom of front face, like I showed.
3. "if you mean upper half and lower half then why not just draw a polyline around the hole thing and close the gap.."
Makes a big n-gon, like I said.
4."if you mean front and back drawing a polyline
why not do the front and copy it and paste the front and use it for the back?
OR fAST extrude it?"
Big n-gon, not good.
5."you say
(You have already extruded the front before tesselating across and then you just closed the back)"
6."how can i tesselating if its not extruded and a closed gap and its just still a line."
Connecting top & bottom of front face with ruled surface makes a surface with facets to tesselate.