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As you might know I own a 12"RC and have produced many images from it, some of my best in some cases.
I have spent a great deal of time learning about RC collimation and the nuances of the scopes. I encourage you to do a fair bit of reading on these scopes.
You need to use a shroud, it is necessary as the light crossing the light path does cause problems for imaging. This design has a very low contrast, any light crossing the light path will reduce that contrast further.
A new focuser is necessary too. I have used an Atlas and Nitecrawler on it. You might consider something cheaper.
Collimation will require the use of a Takahashi collimation scope. It will get you into good collimation quickly and only just need a star test with a slight tweak to get great collimation.
They are good bang for buck.
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