GTA
Make one, I did and it isn't difficult. If I can, I know you can! You can design it to suit the car perfectly and it will cost less. There are also kits out there and all you do is buy some extra steel to increase the width! However if you want someone else to build, it may be worth talking to Martin W as he had a trailer made to a spec. Brian James Trailers made it, I think. That is a nice trailer. However I also have a contact who makes weird and wonderfully odd cars, and he could make a trailer to your spec if you wanted him to. He did all the welding on my trailer for me. One days work. Just depends on his work load. Call me to discuss if you want to.
Malcolm