Make sure your sliders lock on both sides, not just one. Many OEM sliders are fine. If you mount your sliders on an angle so the seat gets higher as you pull it forward, your shorter drivers will thank you. Check to make sure your antisubmarine belt fits your drivers as you move the seat, you can get a second antisubmarine belt if it doesn't.
Cuts, crimps and kinks in your cage tubing will be insta-fail and you will be ripping it out and starting over. Lots of information in the rules and 'How not to fail tech inspection' guide. Make sure your cage builder reads it and follows it. Better yet, find someone who has built cages for Lemons before.