hello all, first time poster. two questions... i am building a late 70s/early 80s motobecane grand touring (round badge) that belonged to my late brother. a cousin had the frame (unknown to me) and went and hacked off all the braze ons an cable guides to make it a lame fixed gear. he also ground off the rear derailleur hanger, which brings me to my first question...

i want this to be a geared bike again. what should i do? have something welded? is there a bolt on aftermarket thing? i don't really care about the cosmetics, but i will be doing lots of touring on this bike and don't want any static in the middle of nowhere.

the second question is with the bb. am i reading the only difference between french and swiss threading is the directionality of the threads? i really want to build this myself, but i'm sort of at a standstill. i don't want to put any more time into this if i can't get a new bottom bracket.

also, there is a 4 digit number stamped under the serial. is this a manufacture date? its 0280.