I generally like a 6" base with at least an inch and a half cap.

there are many cap styles, Ogee, etc.

a cabinet shop will usually have a chart of profiles to choose from

is this a custom project or will you DIY and buy off the shelf?

here is an example of mine, off the rack, $1.20 a foot.

Perhaps you can find what you're looking for here:

https://www.mouldingsone.com/shop-mouldings/small-mouldings/

I have never seen that base cap. It may be a custom shops base trim. You sure it is two pieces?

I think the photo shows a one piece baseboard.

I wanted a simple look for mine and went with this one piece 7.25" baseboard with my 10ft to 12 ft ceilings. I found them at this company ( https://ssiwoodproducts.com/mouldings-ssi/ ), but my builder sourced it from his preferred lumber supplier.

My local lumber yard only had the usual colonial style moldings that have been around for 50+ years!

This 3.5" casing.

I used a simple 7.25" cove as my crown.

I use NO cap, no shoe. . There is no need. Scribe to the floor with a 1 x6" or even a 1 x 8 and leave it alone: ) Clean as a whistle. Great with a simple 2 panel/ 3 panel or single panel doors.

It's one trip around the room, and I doubt very much your inspo is one piece unless a custom knife was created

( actual size 3/4 x 7 1/4 in a 1x 8 )

I agree with Jan .

Found it by doing an image search and the image came from Lowes site of the moulding. Hope this helps. https://www.lowes.com/pd/3-1-2-in-x-8-ft-Painted-Baseboard-Moulding-Actual-3-5-in-x-8-ft/1000575621?idProductFound=false&idExtracted=true