I don't think its a bad idea.
Since I relocated batteries and the coolant tank to make room for the air cleaner and piping I was able to construct the intake for my suburban the way I wanted it, no compromises, using the biggest air filter I felt I could easily get ahold of for a reasonable price, STP SA8037 air filter and since I always like to have a backup plan as an alternative I can use a slightly smaller SA8038 in a pinch (I think the 8037 fits newer dodge diesels and the 8037 fits newer gas trucks of an unknown make).
Basic lay out of my air intake is a lot like yours, ram air with a long run between air filter and the inlet of the turbocharger.
I also went out of my way to use 4 inch piping between the air filter and turbocharger as opposed 3'' pipe which would have been much easier to run.
A larger free flowing intake will not hurt a diesel at all.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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