I Didnt see Etho's factory yet....Heres how to maximimise tin however.
Firstly get some. I know its difficult if you search my posts you will find tips on mining. Then make cells. Then get a nether portal and put a mining turtle in there with the command "excavate 5". The mining turtle will return to you when its full. Collect all the nether wrack (or rack i keep forgetting how to spell it). Then you need to make magma crucibles and Liquid transposers. Put them next to each other so the magma crucible feeds the Liquid transposer. Add your tin cells into the liquid transposer and throw the netherwrack in the lava crucibles. You will get lava cells. Next you need to build an Industrial centrifuge (or centifuges)....You take the lava cells, put them in the Centrifuge and wait (A pretty long time)...bingo you get 40 tin...the cells took only 32 tin to make. Im guessing Etho's factory does this?
You generate 8 extra tin per process.
Ok it is power hungry but if you got the resources you can build a reactor....If you build a safe MK I reactor there is no reason to put it in a re-enforced stone building...A MK I reactor will never blow up. I have a three chamber one just outside my house and it powers everything. You could use any power source you have but I find the reactor is the best at low levels....Many higher gamers than me use solar power....This is good but You can build a reactor without finding some of the ores you need for efficient solar power! You are ofcourse gonna need an MFSU and transformers. Use rubbies to make power crystals...I find them easier to find than diamonds and they have less uses.
Tip: If you search these forums there is a tool for building safe reactors....Its called IC reactor planner....If you search the IC forums there are safe reactor designs.
If you do all of the above in multiple you will have tin flowing from your backside like poop
. The whole process can be automated by macerating and smelting tin automatically...feed the tin into an auto crafting source to make cells. Feed the cells into the liquid transposer. Feed the magma cells into a centrifuge. Since this is a slow process you can use redstone engines to do the feeding.