ur in for alot if u go av10 but don't worry just get some cases and start from there. if u really want to do it u have to be all in.
note the cases treats sells do not come with case bolts or spring mounting brakets,for the the bolts it won't be too hard to find something that will work (i need fine thread) from a good hardware shop but u will most likely need to chop them down to fit exactly.
the spring bracket is a bit trickier, since it is a mirror copy of the av7 bracket, u can't use the av7 one. u can make something or make ur own tension spring as allen did (search performance for this)
the 3rd major pain in the ass is that the stock variator plate from av7's is too thick and will hit the case bolts on an av10, there is a different av10 version that comes on the euro bikes. your options here are to acquire that euro back plate (ebay.fr, rcv-team, luck, etc.), mill down ur existing back plate so it clears (time consuming and requires the right tools and skill) or get an after market variator ($$$$$$$$$$$$$$$$$$ and leads to more problems and more $$$$$$$$$$ from ur wallet to moped shops)
now we haven't even began to discuss the top end or any performance we are still hoping to make it run at this point. when u start to add performance parts builds get complicated quickly as many parts are not as compatible as they might seem. This becomes very apparent when upgrading transmissions. for example certain variators need a kickstart or a drill to start, some need a clutch pulley or u can't idle, others need the motor spaced differently and a performance tension spring setup, the belt sizes start to change with different setups, carb clearance issues... it goes on.
if i where u i'd get the av10 bottom ends, make a custom spring mount, and modify ur existing variator to work with the setup, maybe get a variplus or do a 2 ball setup.
as for top ends don't get a 50cc screamer unless u plan to get a performance variator as well, u will have NO LOW END w/o it.
id go with one of the 70cc kits or a stock 50cc av10 top end, i think treats sells the 50cc axwin one that basically a stock av10 top end, thats good start, it should go as fast as ur ported av7 w/o modification. u can use an av10 or av7 stock head, and the av7 points and crank if u want. (i ran an av7 crank for a really long time in my superbecane with no issues, in fact when it was in its glory days it was running an av7 stock crank) otherwise u should get a malossi or doppler crank but make sure u get the end nut as well from somewhere cuz the novi nut won't fit on.
U can upgrade to cdi later. or get a cheap setup on ebay.fr. ummm that about covers it. If u need the av10 spring bracket i can sell u one cuz i have a few extras but i can't send it out till September sometime.