what heavy Z sad is also a way but ill also give my 2 cents.
my input,
dont make a cilinder that coves the complete top view of the blueprint. just make smal segment and work youre way up from that, or do it whit a plane or even beter Spline's

.
but Gmax wont proberly have the option splines so forget that. also dont select SLICE it has the nasty habbit of slicing around fugly places in Gmax (my personal experiance

)use cut instead. its almost the same but you can make cut (thats way the name cut

), you can make then whit this tool betweens vertex edge or polygons. when youre over a vertex the cut part of youre mouse is smal. when over a egde the mouse grows a little when in the center of a polygon, its realy big. and also turn egded faces on !
but i think (not sure

) that Gmax has the option of Plane, use that instead oa cilinder makes stuff a lot easeyr on ya. and also dont make the main hull out of 1 part but 4 or 5 and target weld them later together saves a lot of time once you know how to and makes it also easyr (atleast for me)
just my 2cents
@Z i like cutting
@EOD Gmax is 90 percent the same as max it just a free waterd down version of 3Ds max what ever version you have

I7 980X, REX3, Dominator GT 12G, 4X XFXHD6970 2G yes Quadfire , SSD 3x Raptors 2X 1.2 KW
