Before Battlefleet Gothic, Games Workshop released Space Fleet in 1991.  It came with 4 plastic ships to build, 2 Imperial and 2 Eldar.  The lid of the box also was used for rolling the dice and was divided into 9 squares and where the dice stopped would determine if the attack hit or not.
GW followed up with articles in multiple White Dwarf magazine issues covering the background of the game a great deal of additional rules and stats and information on the line of metal miniatures that were produced by Citadel.  The articles were in issues 139, 140, 141, 146, 147 of White Dwarf.
The miniatures were quite interesting and the Imperial Fleet grew quite large with many new minis but also some of the support ships were actually re-used miniatures from QT Models whose ships had been aquired by Citadel like several of the miniatures in Citadel's Space Cruisers and C43 and C44 lines.
The Eldar fleet only got 2 ships, the metal version of the Wraithship, plastic ship in the box and a smaller Shadowhunter.
The Tyranid Hive Fleet defined in White Dwarf 146 was quite extensive and did feature several ships that had been part of Citadel's Space Cruiser line in the past.

Eldar Fleet Only a couple of Eldar ships were released for Space Fleet and they had some special rules unique to their movement and defense which I have tried to included to add flavor. Because of the absence of small ships in this fleet, I picked up some 40k Doom Wing miniatures to use as escorts and then when I found the 3D models for all these Space Fleet minis, it was also included with the Eldar so I must not have been the only one with that idea.  Thus it has been included with my interpretation of what it couild be. Solar Wind Rules Eldar ships are powered by vast sails that draw energy from the Solar Wind.  The ships available Thrust depends on the direction of the Solar Wind.  Roll a D6 at the beginning of the battle to determine the direction of the wind for that entire battle. 1-2 - Eldar player's left 3-4 - Eldar player's right 5-6 - Behind the Eldar player The direction of the Solar Wind relative to the direction that the Eldar ship is facing at the start of the turn can  alter the amount of Thrust available to that ship for that turn. Behind the ship +1 To the Left or Right of the ship +0 Front of the ship -1 Holo Field Rules The screens with the Holo Field modification are more effective the more thrust points are used during that turn, distorting the ship's outline and location.  0-2 Thrust - No Screens 3-4 Thrust - Level 1 Screens 5+ Thrust - Level 2 Screens
Eldar DOOMWING Mass 42 Cost 153/129 Average Hull 12 (3/3/3/3) Adv Drives Thrust 6 *Solar Wind* FTL 1 Fire Control 2 PDSs Level 1 Screens *Holo Field rules* 3 Class 2 Beam Batteries (2xFP/F/FS, All arcs)
Eldar SHADOWHUNTER Mass 76 Cost 278/260 Average Hull 20 (5/5/5/5) Adv Drives Thrust 5 *Solar Wind* FTL 2 Fire Controls 3 PDSs Level 1 Screens *Holo Field rules* 2 Class 2 Beam Batteries (F/FP/AP, F/FS/AS) 1 Class 3 Beam Battery (FP/F/FS) 1 Class 2 Plasma Ball Launcher (FP/F/FS)
Eldar WRAITHSHIP Metal version Mass 102 Cost 373/375 Average Hull 28 (7/7/7/7) Adv Drives Thrust 2 *Solar Wind* FTL 3 Fire Controls 4 PDSs Level 2 Screens 6 Class 2 Beam Batteries (3xF/FP/AP, 3xF/FS/AS) 2 Class 3 Beam Batteries (F/FP, F/FS) 1 Class 3 Plasma Ball Launcher (FP/F/FS)
Eldar WRAITHSHIP Refit Plastic version from the original box set Mass 112 Cost 410/423 Average Hull 30 (8/8/7/7) Adv Drives Thrust 2 *Solar Wind* FTL 3 Fire Controls 5 PDSs Level 2 Screens 8 Class 2 Beam Batteries (4xF/FP/AP, 4xF/FS/AS) 2 Class 3 Beam Batteries (F/FP, F/FS) 1 Class 3 Plasma Ball Launcher (FP/F/FS)