[jambo]

Most important is to assess exactly what is damaged. The lock stops on the frame for instance may be damaged. The forks are clearly damaged, but that won't explain the brake lever issue. It's important to assess each part carefully.

For a full GSXR front-end conversion you will need:
Wheel
Front Axel
Top Yoke
Bottom Yoke
Brake calipers
Brake lines
Clip-ons (replacement bars)
Speedo pickup
Front Brake discs
Front Mudguard

Potentially needed consumables:
Front brake pads (assuming the discs and calipers are from different bikes).
Front brake caliper seal kit (if calipers require re-build)
Front Tyre (120/70 R17)
Head race bearings
Front wheel bearings
Front fork oil / service

As you can see, none of this is beyond reason, but it all adds up, most of the people that have broken even on a GSXR conversion have been very careful about buying parts over time when they came up at the right price. If you want the bike back on the road right now, you need pretty much the whole lot above to come up in good condition, undamaged for a good price. You will be buying parts of unknown history so forks and brake calipers should be serviced.

Faced with that list, it's important to know what's wrong with your bike in some detail. If it's just the forks damaged, you can just pay to replace them, and look at a GSXR or similar front end in your own time.

Jambo