I just realized by looking on the map also even tho the country based on a pseudo US State-Federal Relations. The population of each State Republics (not looking at each State population within the Provinces/Districts) is essentially should be like double then or even more then each states in US. I mean the State Republic of Nusantara is essentially the combined popultion of Malaysia, Singapore, and Indonesia. Combined with other States. Indonesia should be like one of the largest populated countries in the world if it’s exist IRL rn. Tbh I always felt impressed seeing this TL and how big this Indonesia ( if its in IRL it’s already the biggest Island/Archipelago country in the world) I remember when the Chapter still talks abt the war with the AUS and british it’s still the Nusantara Archipelago proper but slowly it grows to what it became now.
About system of the Federal Gov. From most chapter when I read it seems it’s like a mix of the Westminster Parliamentary system mixed with the IRL French Presidential Republic isn’t it? In particular abt the Premier focuses on domestic affairs (even tho I saw like LKY in the previous chapter seems have a word in some foreign affairs) and the President have particular focus on foreign affairs (even though some chapter also seems Subandrio have a word in some domestic affairs)
Indeed, Indonesia could surpass the US soon in some extent, but the demographics in the 1980s (boom growth hasn't fully kicked in, US still have the some little boost) Indonesia still lagged just behind the US. Probably in the 90s would Indonesia surpass the US.
Even IRL, Indonesia is still the largest archipelago country. This is definitely a wank, some might assume borderline-ASB, but it is still feasible.
About the parliamentary system, you're correct. The latest constitution compels a French-style semi-presidential. Although, as any third country, alterations still happen and the book doesn't always match the field. On the Premier-President relationship, indeed I positooned them as more 'co-op' leader rather than purely Frensh style.