Okay, mine came in today via FedEx to my local hobby shop. If you are having it come to your house, great, because the box dimensions are 19 1/2 x 14 1/2 x 58 inches. Big box! I will unpack it tomorrow morning and examine it more closely. I will post the firewall measurements and try to give you an idea on the cowl. I plan to use my VVRC 40cc slant plug twin, but I have another motor (Ngh 30 cc 4 stroker) that I can "trial" fit for you. If they fit with no cutting, anything in that range/size should be no problem. I haven't posted pics on this site (any site for that matter), but I can take photos and send them to any of you via email and you are welcome to re-post any pics. Any other questions that you have, just let me know and I'll try to get back to you asap. Good luck with yours! Al