H is the size of the display case you will need.
Although it was only 1,040 meters long (65% of the length of an Imperial -class Star Destroyer), the Nebula -class was built to be a match for an Imperial IIĥ2in. On the other hand From STAR WARS to Indiana Jones, which gives the eleven times length figure for the Executor, supports the usual one-mile star destroyer theory This implies that the Executor is at least 106km long.
The behind-the-scenes book From Star Wars to Indiana Jones: The Best of the Lucasfilm Archives (1995) showed the film props and stated that the Executor was conceived as eleven times the size of the original Star Destroyer, which itself was one mile (1.6 km) long.Home Super Star Destroyer size Executor-class Star Dreadnought Wookieepedia Fando
