Probably OK if the new lower supports are the same length or shorter. Looks like a lot of work and more wood to accomplish the same support.
As per the rough photo I've included, I have a vaulted ceiling I'm doing but was hoping to remove the existing underpulin that supports the old rafters and re-support them off of the new LVL rafters that will be placed below them. Are there any issues supporting the the upper rafters with a strut from the new lower ones?
Proposed Plan for Vaulted Ceiling_reduced2.jpg
Probably OK if the new lower supports are the same length or shorter. Looks like a lot of work and more wood to accomplish the same support.