Brakes are pretty damn good being designed for the CBR900. Service them and you should have no trouble.
Forks and shock will both need a rework as they'll be several years old and setup for a Japanese waif.
To be honest you're better going with an MC21 as they have a conventional ignition setup, not the HRC card. They also have a twin sided swinger which is lighter than the single from the 28.
However, if you've already got a 28 I guess that'll do!
If you want to convert the thing permanently, then it's worth stripping the wiring loom down so it only has the neccessary bits in it. I have done this on the NC, and it's amazing how much weight you can ditch. This also allows you to site the CDI further forward for crash protection and ditch the charging system.
Don't remove the kick start. It weighs fuggall, and when you stall in the holding area / grid you look a pratt as you try to bump start it.
Ditch the thermostat and tape up the rad if it's running too cold.
Cut the webs from within the airbox to double the capacity.
Use a non O-ring chain, as they sap less power and weigh less.
Saw the back end of the sub frame off as it's doing nothing to support you.
Ditch the rear brake reservoir and just use a longer piece of hose taped to the frame.
That little lot will get you going for the weekend!
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball