I suspect you are not talking about redesigning this in a FS2004 compatible design program -- simply that you want to fly this chopper in FS2004.
Most likely this was designed with a program called FSDS v1. All aircraft designed in this program will have 'non compatible' features - mainly that props & rotor blades, in the case of helicopters, don't show up visually in the sim, & wheels don't show ...
You have a simple choice: You can click no when asked about 'disabling non compatible features' (or whatever) .. sometimes this renders the machine quite OK in FS2004 - but in my experience helicopter blades won't appear in early FSDS designs ....
or ..
You can go & find a similar bird that WILL work in FS2004 - so what's the machine? There is probably a simple answer your request ....

Simplicity is the ultimate sophistication. – Leonardo da Vinci