bro its not a big deal at all, yes there will be a mesh and you cannot put a pipe thru the tank, just take out the rear seat and you will find something like this underneath

it will be just 3-4 screws and you will have access to the inner fuel tank, easy peasy,
and even if you get fuel tank down, its not a big deal at all, only half an hour job and without any hassle and i dont think any thing can go wrong with downing the fuel tank.