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Basically the SM +4 thing given in space ships 4 allows for making down to van size shuttles and such.
Below are guidelines for making normal car size SM +3 vehicles.
Hull Size Table
| SM | Loaded Mass | Length | dST/HP | Hnd/SR |
|---|---|---|---|---|
| +3 | 3 tons | 7 yards | 10 | +1/3 |
| Armor | USL | SL |
|---|---|---|
| Light Alloy Armor | 1 | 0 |
| Metallic Laminate Armor | 1 | 1 |
| Advanced Metallic Laminate Armor | 2 | 1 |
| Nanocomposite Armor | 3 | 2 |
| Diamondoid Armor | 5 | 3 |
| Exotic Laminate Armor | 7 | 5 |
Cargo: 0.15 tons(300 lb)
Cloaking Device: $100k
Contragravity Lifter: $30k
Control room: need 3 spaces to fit in a SM 4 control room(smallest full control room) or 2 spaces to fit in a building/ground vehicle control(Pyramid 3-34 Alternate Gurps) room at half the regular SM 4 control room cost.
Defensive ECM: $30k
Enhanced, Science, Multipurpose, and Tactical Array: Array Level TL-6: $6k base cost
Force Screen: dDR 10 (at TL11) or dDR 15 (at TL12): $50k/$150k
Fuel Tank: $1k 0.15 tons(300 lb)
Hangar Bay 0.1 tons(200lb) capacity $300
Mining 0.015 tons(30 lb)/hour
Passenger Seating one seat takes: 4 spaces for a full seat. 3 spaces for a nbc filterers only, 2 spaces for no life support. Cost: 1k*spaces.
Refinery 0.05 tons(20 lb)/hour
Other things are 10% the cost of SM 5 things. Same forbidden systems as SM 4.