Well from my experiences with my road mini velo build I would recomend going with the biggest front chainring you can get, the small wheels naturally gear the bike for hills your bigger issue will be top end. I am curently running a 56t up front on my bully in a 1x10 setup with an 11-32t cassette and I am getting 35-100 gear inches which is pretty comfortable going up some very steep inclines, I can't see anyone needing an even lower gear but you do probably want the top end as high as possible. Just so it is apples to apples here is my mph@40rpm according to sheldon brown with the closest cassette he had.

[TABLE]
[TR]
[TD][TABLE]
[TR]
[TD][/TD]
[TH="bgcolor: yellow"]56[/TH]
[/TR]
[TR]
[TH="bgcolor: yellow"]11[/TH]
[TH="bgcolor: white"]12.1[/TH]
[/TR]
[TR]
[TD="align: center"]18.2 %[/TD]
[/TR]
[TR]
[TH="bgcolor: yellow"]13[/TH]
[TH="bgcolor: white"]10.2[/TH]
[/TR]
[TR]
[TD="align: center"]15.4 %[/TD]
[/TR]
[TR]
[TH="bgcolor: yellow"]15[/TH]
[TH="bgcolor: white"]8.8[/TH]
[/TR]
[TR]
[TD="align: center"]13.3 %[/TD]
[/TR]
[TR]
[TH="bgcolor: yellow"]17[/TH]
[TH="bgcolor: white"]7.8[/TH]
[/TR]
[TR]
[TD="align: center"]11.8 %[/TD]
[/TR]
[TR]
[TH="bgcolor: yellow"]19[/TH]
[TH="bgcolor: white"]7.0[/TH]
[/TR]
[TR]
[TD="align: center"]10.5 %[/TD]
[/TR]
[TR]
[TH="bgcolor: yellow"]21[/TH]
[TH="bgcolor: white"]6.3[/TH]
[/TR]
[TR]
[TD="align: center"]9.5 %[/TD]
[/TR]
[TR]
[TH="bgcolor: yellow"]23[/TH]
[TH="bgcolor: white"]5.8[/TH]
[/TR]
[TR]
[TD="align: center"]8.7 %[/TD]
[/TR]
[TR]
[TH="bgcolor: yellow"]25[/TH]
[TH="bgcolor: white"]5.3[/TH]
[/TR]
[TR]
[TD="align: center"]12.0 %[/TD]
[/TR]
[TR]
[TH="bgcolor: yellow"]28[/TH]
[TH="bgcolor: white"]4.7[/TH]
[/TR]
[TR]
[TD="align: center"]14.3 %[/TD]
[/TR]
[TR]
[TH="bgcolor: yellow"]32[/TH]
[TH="bgcolor: white"]4.1

[/TH]
[/TR]
[/TABLE]
[/TD]
[/TR]
[/TABLE]
Also I would recomend going with the narrower aeroheat rims if you are doing 1.35 road tires, they will sit better in the rims.

I personally went with 160mm rotors on 406 wheels for my brakes and 135mm mtb hubs and they work well although I am using short pull road calipers and long pull mtb levers(speed dial7) and I have brakes to spare. you could probably afford to go with the smaller 140mm discs but the 160mm ones are easier to find in kits with the calipers.

Good luck on the build, can't wait to see how it goes!