I'm trying to make a model of this cone-shaped piece I found online for practice for the CSWP. It is a fairly complicated piece with interesting dimensions and constraints. I had several issues, but finished modeling it in a very roundabout way and am wondering if there's an easier way to do it.

To create the extrusion on the right I created a reference point (Point 1) at the top of the central axis and a reference plane (Plane 1) with constraints tangent to the conical face and perpendicular to the front plane. I then created another reference plane (Plane 2) parallel to Plane 1 and passing through Point 1. Then I created Plane 3 parallel to Plane 2 and offset by 11mm. That way I could extrude from Plane 2 up to Plane 3 and it would be the correct dimensions, as given on the dimensions sheet.

My problem happens in the next extrusion, which is basically the same as the first one except at a 45 degree angle from the front plane. I made a reference plane (Plane 4) passing through the central axis and 45 degrees from the front plane. This new plane would "stand in" as the front plane from the first extrusion. So I followed the same process, trying to make another plane (Plane 5) tangent to the conical face and perpendicular to Plane 4, but it came out at a strange angle. Both constraints are satisfied, but it won't let me put a 3rd constraint to keep the horizontal axis of Plane 5 parallel to the top plane of the part. I've tried all kinds of stuff to make this work and I'm not having any luck.

So here's my main question: is there any way to manipulate the orientation of a reference plane? I'd like Plane 5 to come out tangent to the conical face and perpendicular to Plane 4 with the horizontal axis parallel to the top plane of the part, but I can't figure out how to do it without getting errors. In addition to this issue, even Plane 4 came out sideways from what I wanted. I'd still like the y-axis to be pointing the same direction as the y-axis of the whole part. Is there a way I can change that?

Other Issue: Ideally I'd like to extrude a sketch on Plane 2 beginning from the inside of the cone and ending at Plane 3, but it kept giving me an error message. Is there a way to do this? I ended up just extruding it from Plane 2, converting the inside of the cone into a new revolved cut feature, and cutting out the unneeded section.

Any input is appreciated.