The design should give you an easy to install, "plug-n-play" railing system that requires minimal cutting and modification. (As always, you must apply on-site means & methods practice for proper installation. See our means & methods disclaimer.)
System Required:
1) CRHR (handrail for stairs)
2) CRFR (flat railing)
3) CRPT-180ACon
4) CRPT-180FCon (if required)
This system will give you a height of just shy of 40" for the flat/horizontal walkway sections and 36" tall for the stairs section.
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Connecting the top rail should be easy.
Here are the sequence of installation:
https://www.loom.com/share/d964eb86bcf740059c831dc2359eb29f