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JC5 casing and JB3 internals

English is not my first language so I am using a translator.
I am evaluating a custom gearbox build for a Clio MK1 2.0 8v (F3P/F3R) with a 272° camshaft and Williams driveshafts. Before sourcing parts, I need to verify if this specific combination of components is physically compatible.
Main Casing: JC5 (from Megane 1 Coupe 2.0, Scenic, or Clio RS). This is required to accommodate the Williams driveshafts.
Gearset (1st - 4th): Internal gears from a JB3 044 (Renault 19 16V)
5th Gear: A 0.738 ratio from a Renault diesel (dTi) for highway cruising.
Differential: Blackline HLF053 Helical Gear LSD.
Reinforcement: Differential Circlip Reinforcement Plate

Shaft Compatibility: Will the JB3 044 internal shafts and gear clusters fit into the JC5 casing without interference or the need for custom machining?
Selector Forks: Are the selector forks from the JC5 housing compatible with the JB3 044 gear syncros?

LSD Fitment: Does the Blackline HLF053 (designed for JB3/JC5) fit correctly when using the JB3 internals inside the JC5 housing?
5th Gear Swap: Is the 0.738 diesel 5th gear a direct swap onto the JB3 044 output shaft?
If anyone has performed this specific "hybrid" build or has the internal measurements to confirm compatibility, your input would be appreciated.
 
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