For those who feel the GEN1 is too big, here is a 50% smaller GEN 0.5. It is actually 1/4 of the power and mass of the original, because of an inverse square law of proportions. Is is a lot lighter than the TOS Enterprise, since it is made of lightweight composite, rather than super futuristic battle armor.
Mostly drawings 
How far can it boldly go, Michel?
Solar system only. Mars, venus, mercury, no problem; Jupiter in a pinch. Saturn a bit too long travel time at base design, but could go with low cargo, reduced crew and upgraded reactors and engines.
how big is gen 0.5 enterprise i mean like length wise etc