I don't really see the point in a reactorpack. My lappack provides me with (literal) days of mining happily and no way my lappack is empty before I run out of space.
In the case of a mining laser, i suspect 128eu/t will provide you with a longer lasting time than a lappack but then again, your inventory space will run out rather soon.
Also, why do you start from a T4 genpack? Wouldn't it be more logical if you start from a lower tier? (as in generator + 2 leather = genpackT1)
And you might be wanting to change the recipes, the general rule here is that no new item construction items or resources are implemented unless it has a ton of uses.
You make 3 new items for only 1 in-game useful item. Depleted uranium ingot, uran-triferrite, peltier unit...
I think this best gets some rework. (and you might take a look at the archieves just in case something like this already got denied, saves you a headache later)
I like depleted uranium ingots though, they make excellent armour penetrating bullets
Thanks for the constructive criticism, im gonna rework this suggestion