Years ago I made a airbox for a mk1 2.0 with Webers. I used a cheap $9 toolbox and trimmed where needed and changed the lid to open with half the box so access to air cleaner(Datsun 240z ) , I then used a mk2 Flexy air duct to take air from where the battery was, I'd made a hole in that panel for the duct to sit in. I later cut slots on the underside of box to let any grit, bugs, rain , excess air pressure etc out .I used a Datsun air cleaner so I could still keep the billet Ally trumpets.