i think the cabin of the CW plans could be altered by 3" longer inside the cab ,along with some widening across the foot pedal box area ,so the firewall and front are equal across ,then the front and rear sections for suspension could stay the same and use custom offset rims with tires
VENTADOR
DIMENSIONS
Wheelbase:2,700 mm (106.30 in)
Overall length:4,780 mm (188.19 in)
Overall width (excluding mirrors):2,030 mm (79.92 in)
Overall width (including mirrors):2,265 mm (89.17 in)
Overall height:1,136 mm (44.72 in)
Front track:1,720 mm (67.72 in)
Rear track:1,700 mm (66.93 in)
Dry weight:1,575 kg (3,472 lb)
Weight/Power ratio:2.25 kg/CV (4.96 lb/CV)
Weight distribution (front - rear):43 % - 57 %
MERCI frame
Wheelbase : 2665 mm (104.9 in) or ( 10.5" ) stretch fiero
Overall length : 4580 mm (180.3 in)
Overall width : 2045 mm 80.5 in)
Overall height : 1135 mm (44.7 in)
Front track : 1635 mm (64.4 in)
Rear track : 1695 mm (66.7 in)
Ground clear. : 135 mm (5.5 in)