I could be off, but I'd say a safe estimate would find the $3-$5k range for the "upgrade PARTS' alone (nice rims are an easy $1500-$2000 alone plus tires and such) - this assumes you are doing 75%-85% of the work yourself.
If NOT, then ADD to that price of parts all off the LABOR charges that will incur.
And THEN ADD any and all mods that included custom fabrication that the above parts did not cover.
Cost will also be affected by location, geography, relationship with workers, project manager, etc.
Suuuuuuuper expensive friend lol.
PS - I am pretty confident in my quote above, however: If it turns out that I am WAY OFF the mark here with my numbers then I ask you to please let me know so I get a better idea of this stuff. Thanks
Veteran - Air Force Special Operations (AFSOC)
"Ad Astra per Aspera"
2016 Street 750