Since this stack was completed in 1989, it will only be about 15 years old when it comes down. This is probably an unprecedented short lifetime for a stack. The original design for the BW8 interchange shows the exit lanes flying over the main lanes to connect to the existing ramps, which would have been in the middle of the new freeway. To position the ramps where they belong, outside the main lanes, it will be necessary to reconstruct all the ramps. TxDOT chose to do it right.
All schematics are subject to change until construction begins.
The existing ramps are shown by the faint green lines. The new interchange will be nearly identical to the existing stack, except that the ramps connecting to westbound IH-10 will be shifted northward. All the new ramps will still have only one lane, which is a surprise to me. I don't know if the IH-10 lanes will go over or under Beltway 8. The connection ramp from BW8 merges with IH-10 westbound right over Wilcrest.