Meet the Sigma Draconis Galactics. They're a semi-corporate empire whose main export is fleet units, with a secondary market in ground forces. If you want heavy units but don't have a shipyard, then they'll sell you one of their export cruisers.

Here are a couple of their designs:

Draconis Class Heavy Cruiser of the Sigma Draconis Galactics   ( 697 )
Mass: 250.8 KmT, Crew: 588, TL:   E:0  W:0  D:0  Q:0
Hull: 12 11 10 9 8 7 6 5 4 3 2 1
Engines: 2 1
Defenses: K: 5 4 3 2 1 | E: 5 4 3 2 1 | B: 5 4 3 2 1
[a] Rapid-Fire Coil Gun [4/8/12, 4+ 2/1/2, Kinetic, Re-Rolls Penetration Dice]
ABCD, ABCD, ABCD, ABCD, CDEF, CDEF
[b] Plasma Torch [3/6/9, 5+ 1/1/2, Energy, Extra Hull Damage, Range-Based DMG]
AC, BD, C, D
[c] Pulse Cannon [3/6/9, 4+3/1/1, Energy, Re-Rolls Penetration Dice]
ABCD, CDEF
Hyperdrive [O], Electronic Countermeasures [O], Armor Plating, Passengers (100)
1[Ha], 2[Eb], 3[Hc], 4[D], 5[H], 6[Q]

The Draconis is a relatively powerful cruiser, considering its mainly an export cruiser. The Sigma Draconis actually keep a few of these themselves, mainly for important convoy protection. It's primary weapons are the coil guns, but the plasma torches can leave you with that burning feeling which isn't heartburn...

Daemon Class Light Destroyer of the Sigma Draconis Galactics   ( 90 )
Mass: 68.4 KmT, Crew: 195, TL:   E:0  W:0  D:0  Q:0
Hull: 5 4 3 2 1
Engines: 6 5 4 3 2 1
Defenses: K: 2 1 | E: 2 1 | B: 2 1
[a] Rapid-Fire Coil Gun [4/8/12, 4+ 2/1/2, Kinetic, Re-Rolls Penetration Dice]
AB, A, B
[b] Pulse Cannon [3/6/9, 4+ 3/1/1, Energy, Re-Rolls Penetration Dice]
ABCD, CDEF
Hyperdrive [O]
1[HD], 2[EQ], 3[Ha], 4[Ea], 5[Hb], 6[E]

The Daemon, a standard light export unit. Its sales are quite high, with both governments and non-governmental bodies buying these vessels. They're not the strongest of craft, but their speed and reasonable armament will make anyone think twice.