That's interesting, I tought often about the size of the spaceships, while reading.
According to the books and the known informations, the probable dimension are, IMHO :
- 9-10 meters for the Bug Fighter (same lenght for Tail-fighter)
- 90-100 meters for the Blade ship
- 100 meters for Pemalite ship
- about 500 meters for the truck ship in #3 The Encounter
- 300-400 meters for Nova-Class Empire
- 1000 meters for Dome ship
- maybe about 2500 meters for Pool Ship from paw to paw
It's more difficult to evaluate the weight. This ship must hover in the air apparently weightless; is unknown how powerful are the engines and how they works; is unknown what material are made of, or if they are for the most part full or empty to be as light as possible (but it seems they don't need to be sustained by air). We only have an idea of the internal of a bug fighter, and we can assume it is a single room with the instruments. I think it could weigh in a range of 5-10 tons, not more.
I'ts difficult to estimate other ships, but a Blade ship could be in order of 1,000 tons, a truck ship approximately 50,000 tons (empty, maybe twice full), a Pool ship about 800,000-1 milion tons. But these are mere hypotheses, totally random, relying on the fact that the ships should be quite light and mostly empty for maneuverability and speed.