Help with making transparent parts not render weirdly

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#1

I need help on making transparent parts not appear weirdly.

METHOD 1: Set the wedges transparency to 0.75 (what I want it to be at.)
Result:

image
image1783×716 42.9 KB

A weird rendering bug :x:

METHOD 2: Set an image / decal on the sides of the wedge.
Result:

image
image1920×734 44.1 KB

Some wedges being different shapes etc. Resulting in it looking like method 1 with some of the parts. :x:

Is there anything else I could do to just make it look okay.
This guy managed to do it:

I CANNOT UNION THEM