Height Info. Needed for Art Deco Underpass Please

Does anyone here have the HO Walther’s Cornerstone “Art Deco Underpass” on their layout?

I’d like to know what sub roadbed /riser height will be needed to have the bridge rails line up with the approach (risered) roadbed/track.

I have my present plywood sub roadbed at a height of 3 1/2" from bench top to the top of 1/2" ply. (with no cork roadbed/track on it.) Or 3 3/4" total height with cork roadbed and track.

I’d like to know (before ordering the kit) if I’d need to redo grades/riser adjustments to use this kit. Is it pretty easy to shorten the

kit parts 1/8" to 1/4"? Thanks very much if if you can help.

Found the info. in Walther’s catalog. Couldn’t delte or edit the above post. Sorry,Thanks.