There have been several 2000S builds documented here, search for "2000S build".
Just a FYI though, a 2000S is a BIG freekin' cab. In person it seems a
lot larger than the 200S cab; more so than the dimensions would indicate;
If you mean recones for the D, K, and E series JBL's, "cheap" and "recone" don't go together. The factory kits for the D and K are long gone, and while there may still be some factory E kits available they cost in the hundreds of dollars; the good news is that all of the drivers can take the E kits.
There are aftermarket kits available, but the ones I've tried don't sound the same as the factory cones. There may
be some, but I haven't run across them.
All that said, there are some excellent reconers out there who can certainly do a great job. Orange County Speaker does excellent work, but like "cheap recone" and "JBL"don't go together, "shipping" and "raw drivers" don't always go together either.
Where are you located?