Very nice looking model Xan.
Now you have the Gunze paints you can look for a gunze / tamiya conversation chart, If you are wedded to tamiya.
Tamiya paints don’t need a primer, but Vallejo do. My preference is to prime Whatever and my go to primer is gunze mr finishing 1500 in black thinned with their levelling thinner, which imo is also the best thinner for tamiya paints.
Also check Prez’s build on here and see if he mentions what colours he used for his recent build.