From the introduction:
The first section covers extensions to the High Guard starship design sequence and vehicle design sequence to allow Traveller players to design “archaic” TL-6-8 rocket propelled small craft, including small space capsules, planetary landers, space stations and rocket launch vehicles. Some example craft are presented, including deckplans. This section will be particularly useful in the post-Third Imperium 1248 Milieu where technologically regressed societies abound. In some cases those regressed societies may only have access to data on primitive rocket power, despite having a nominal tech level of 7-8. Therefore they may use rockets as opposed to the standard maneuver drives found at those same tech levels.
The second section covers 10 and 20 ton small craft, including deckplans and variants on the standard craft. Classic Traveller statistics are included. While the small craft in this book are defined using those statistics, the statistics and deckplans may be used with little modification for Traveller games based on other Traveller rule sets. Full deckplans are included, as are adventure seeds based around the small craft in this booklet.