draw 2 circles for your wheeldistance and 2 for your wheelspace,
in the sideview, draw 2 curves which should be somewhat how the carbody is going to flow,

move the 2 curves slightly backwards,

again in the sideview draw a curve for the basic lower shape of the body (youll split most of the surfaces with this curve)

cut off the wheelspace curves with the lower body curve,
loft curves 1 and 2 and do the same with 3 and 4,

cut of the surfaces somewhat of where you think the blending between the 2 bodies should begin,

now blend (not blendsrf) the upper edge curve of the first part with the upper edge curve with the back part,

do the same with the lower part,

now, both curves are too turved for me so i deleted bith 2 midpoints of both curves to make the curves more tightened,
select sweep 2 rail and use the 2 blend curves as profile curves and,...

you might want to add a ribbon, dont have to but it looks better to me and the end result should be something like this,

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