your will need a few items if you want to make a copy of his:
83-84 250r front fender bolts on
83-84 250r front forks bolts to all your 200x stuff since its all the same. you will need 83-84 250R triples...then take then stem out and bore the hole at the bottom for the 200x stem (its largers idk why) install and bolt up.
in the rear unless you have $600 for a new durablue axle which you can use off a 82 250R which will make the bike plus 6. If you do not have that kinda coin just buy offset 8" rims 3in 5 out and some 400ex hubs...I have a set and bolt them up. you will get to about 45" or so. Which is already +3 from the factory 200x. that may take you some getting use to anyway.
His rear tires are just some turf tramers so if you ride in any kind of mud they will cake up and become a slick. ITP make them with out some lugs now like everyone had to cut back in the 90's
send tammy at cosmic quads your seat and for a good price she will make it like his.
keep your rear fenders because I would not run fiberglass ones to trail ride. His swinger is I think plus 2, but its all aluminum so unless you know a guy who make reproduction swingers...wait I do (mike at
www.hreatv.com) I would just cut yours in half and have a welder extend it 2"
keep your metal tank if its nice..if its rusted id sell it to some kid on CL cheap and buy a IMS short tract plastics one or a clark oversized one...in red because white plastics turns yellow in a few years.
Anything else you want to know?