sm_3

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 large car size SM +3 vehicles and mini car size SM +2 things.

Hull Size Table

SM	Loaded Mass	Length	dST/HP	Hnd/SR
+3	3 tons	7 yards	10	+1/3
+2	1 ton	5 yards	8	+1/3

Armor	SM 3 USL	SM 3 SL	SM 2 USL	SM 2 SL
Light Alloy Armor	1	0.7	0.7	0.5
Metallic Laminate Armor	1.5	1	1	0.7
Advanced Metallic Laminate Armor	2	1	1	0.7
Nanocomposite Armor	3	2	2	1
Diamondoid Armor	5	3	3	2
Exotic Laminate Armor	7	5	5	3

SM +3/+2 modules

Cargo: 0.15 tons(300 lb)/0.05 tons(100 lb)

Cloaking Device: $100k/$30

Contragravity Lifter: $30k/$10

Control room:

SM 3:Need 4 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.
SM 2:Need 12 spaces to fit in a SM 4 control room(smallest full control room) or 7 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/$10

Enhanced, Science, Multipurpose, and Tactical Array: Array Level TL-6: $6k/$2 base cost

Force Screen: dDR 10/7 (at TL11) or dDR 15/10 (at TL12): sm 3: $50k/$150k sm 2: $15k/$50k

Fuel Tank: $1k 0.15 tons(300 lb)/$300 0.05 tons(100 lb)

Hangar Bay 0.1/0.03 tons(200lb/60lb) capacity $300/$100

Mining 0.015/0.005 tons(30/10 lb)/hour

Passenger Seating

SM 3: 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.
SM 2: one seat takes: 12 spaces for a full seat. 9 spaces for a nbc filterers only, 6 spaces for no life support. Cost: $300*spaces.

Refinery 0.05/0.015 tons(20 lb/6lb)/hour

Other things are 10% the cost of SM 5 things for sm 3 and 10% of SM 4 things for SM 2. Same forbidden systems as SM 4.