Tegg Bode: Yah sim crossings are murder on these kinds of vehicles. If you check the ad the seller states that it has "sim edge airbags" or some such to prevent it from crossing sim lines so that it doesn't break apart.
Eudoxus Theeuwes: You're really hung up on terminology

which as a non English primary language speaker I can understand.

On your 512 ~ 117 prim thing and stuff over that being fake. That is really an incorrect way to look at it. a 512 plot is nothing more then a segment of a full sim. If you're going to look at prim allotment you may want to do it on a sim basis. A class 5 full sim can support 15000 prims. A homestead can support 3750. A homestead is the same ingame-physical size as a class 5 sim (from what i recall) but due to sharing resources with other homesteads (4 homesteads to a single computer, unlike class 5 sims that are 1 per computer, from what i understand) its been limited to 1/4 the prims of a full sim.
That ship is easily rezzable on both a homestead and a full sim, however I doubt it would perform as well on the homestead and would eat up half the homestead's prim allotment just being out

whereas it would only take a small chunk of a full sim's prim allotment.
On Real / Fake: In game design, and that goes for virtual worlds like SL also, you are limited by hardware and internet connections as to what you can/can not do. If you were to drop some 750k polygon model into SL and expect it to render, let alone move you'd be horribly disappointed when everything crashed

Graphic Designers/Artists must balance polygon usage vs looks and that's where good texture artists come in. Both these artist types are skilled at doing more with less. It's always a question of "How good can i make this look and how few polys can I use to do that?"
Builders in game, using the in game tools, at least the really good builders, also balance prim useage vs looks and try to make something as detailed as possible with as few prims as needed. Anyone can toss more prims at something to try and make it look good but a very skilled builder will do it with textures and far fewer polygons whenever they can.
Don't get hung up too much on terminology, just enjoy your SL
