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you need to get the cross pattern right
As I intimated earlier, maximum number of crossings in the regular wheel building guides assume the ERD is many times the flange PCD. You can't build little wheels with this many crossings, but on the up side you can cut the crossings compared with big wheels and still have the spokes close to tangential to the flange pitch circle. If in doubt, make a drawing before you start to see what it's going to look like.
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the question of cross brace or not to cross brace
If you mean interlacing, that's a question on big wheels. There's no way I'd either want or need to interlace on little wheels.
gbj_tester
@arup
From my experience of building small wheels is that you need to get the cross pattern right in order to get the nipple to line up especially if the rim has eyelets. It's fiddly enough getting your spoke key in and out but if the nipple angle is wrong then you'll have a harder time turning them. Also with a shorter length you may need to pre-bend the spoke before you can put the nipple on it which can feel like a no no when it's your first wheel build. And then the question of cross brace or not to cross brace.
Not trying to put you off but just trying to make you aware of the issues that you will more than likely encounter.