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You are not specific about your cameras. The DSLR will have problems because of the large distance between the rim and the sensor. Small planetary CCD cameras generally have the sensor much closer to the mount rim and they can focus. The DSLR is not the best for planetary work anyway except in video mode.
If the mirror cell will fit further up the tube I would not be cutting the tube I would just drill a few more mounting holes 50mm up the tube. That way you can restore it if you want to sell it later.
Remember by moving the primary further up the tube the secondary may be too small and you will experience some clipping. If you only have a 1:1 focusor then going for a low profile 10:1 one might be a double improvement.
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