That should be good for mounting, i can include a strip of sekisui thermal tape if you want, but its not as good as filling all the gaps with thermal adhesive.
1 Ohm gets you 1.25A. The 10uF caps on the input an output are required for the LM1117 since it is a Low Drop Out type of regulator ... it keeps the driver stable.
^ ^ Hi Extrion... Do you mind telling me what you're firing in what looks to be an unfinished room in your avatar? It appears to be some sort of laser gun, something the idea of building often wakes me in the night.