Not saying don't to go with a collapsing column or soft dash, but I think that is alittle overkill for a bucket. These are not your daily modern drivers with crush zones, safety coccoons, air bags, etc.... These safety questions have been brought up many many times in the past. Especially the seatbelt debate - whether to have them and whether to mount to the frame or body. Many want them mounted to the body and many say the frame. You want them mounted to the frame. That is fine, just make sure your body does not copy the example shown in the picture above. If so there will be TWO very bloody sheets. I am of the opinion that seatbelts in a bucket are mainly to keep you inside if you hit sometime (say under 15 mph) or you hit a road bump that wants to throw you out. If you have a major accident in a bucket I feel you will not survive anyway, so a collaping column or soft dash will not matter in the least. I consider T buckets and motorcycles about equal in the accident department, and I do not see many seatbelts on a motorcycle.
just my 2 cents....
and I do not care at all for the expanding rubber body mounts. Use a rigid metal mount, 1/2" minimum hardware and big@ss washers.