The number of quarries running into it doesnt matter- its more a proof of concept than anything, and its very easily scalable for the crazy amount of quarries you run.
As for dimension jumping your materials; I usually stick to enderchests.
Has anyone tried dropping loose items into a mystcraft portal, and collecting with a redstone engine on an obsidian pipe?
works fine .. but can cause lag when u do so whit too many gates ..
best way is 1 over world gate and all gates link to this one .. the problem only is when u do so DONT enter it for some reason it kills client ..
and yes it depens on how many quarrys u have .. since depens on how fast u get rid of the materials .. if u too slow well .. welcome entity lag
enderchests has atm some bugs and for unknown reason they dont accept the size command .. so when u stick more then 1-4 quarrys to 1 ender chest .. well ... ya i know color coding etc can prevent this .. but ender is still buged .. i cant color the middle .. and cant use green blue and yellow it cause item disapear when something enter the chest
and still shiftclicking stuff into ender cause crash even on pouch so this isnt a good option for me atm ...
http://bg.mytrandir.net/ftb/gate1.png
http://bg.mytrandir.net/ftb/gate2.png
http://bg.mytrandir.net/ftb/quarry1.png
http://bg.mytrandir.net/ftb/gate2.png
http://bg.mytrandir.net/ftb/storagecart.png <- is the cart that takes the stuff from quarry to my sorting (max posibility of space u can add to 1 cart .. make 2-3 on a circle and u can add so many quarrys u like when u do a overflow system to ur quarrys .. alternate way is using more diff. carts in each dimension to get stuff to ur main gate ... or build in recyclers directly to quarrys to get rid of stone, dirt, sand etc ..)
its just a small version of my original one .. it would take too long to copy it ..
http://bg.mytrandir.net/ftb/recycler.png goes to a mattfab