Well... okay, to address a few things.
First, the scout kits are junk. They're the worst
GW plastic space marine (including chapters) infantry kits that are sold. There are like... 2 standard standing poses of legs? Plus 1 crouching for the cloak, and the heavy weapons setups. All the upper torsos for the bolt gun/bolters are the same, and the quality of the plastic/cast is like... well, a decade old. Oh yeah, and the heads are ugly.
The only other space marine infantry kit that's as old is the Command Squad, and that's a much better kit. Plus, the unique pieces in it can be combined with generic, newer, cleaner pieces (like legs). On the other hand, the scouts don't have nice fittings for, well, much else.
Scouts are also the only infantry kit where none of the pieces are interchangeable (except between the two scout kits). The arms, for instance, use a different size shoulder.
But, this actually
makes sense. Because they're not in power armor. So sadly, if you go the legion route (or the new
FW marines with sniper rifles), as cool as they look, that's not what they're supposed to look like.
Sooo... what to do?
The upper torso (chest) is actually not terrible, and is the most distinctive piece of a scout. So that is usable. The Tempestus Scions have similar, but much nicer looking legs that would work with some conversion (you'd also have to get rid of the markings):
Note that the little flaps that go over the legs are part of the upper torso, not the lower one. The heads are actually not bad, too.
You also have the Elysians, from
FW, that are a nice model and have conversion/kitbash potential:
In the end though, I said screw it. Why?
Well first off, scouts are not a low-model-count unit. I'm going to be building 40 standard, 10 camo, and some mix of heavy weapon guys. It would cost a fortune to combine them with elysians or scions.
But even if the cash register didn't stop me, I don't really love the arms that come with scouts. They are repetitive, dated, and fixed to a few angles. And, the Scout chest doesn't work really well with other arms. plus, there's literally ONE chest -- no variety. There's not really any way to substitute them, because the arms have to look like they're wearing half-power-armor (and have some decal space).
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