The long range guided rocket project is of 300mm dia unless we are mistaken. Prahaar was 400mm+ dia class, probably a bit more. There is some mystery there, maybe IA was not happy with its payload 200kg warhead ? or some other navigation or otherwise. That project is in a mystery status. Maybe the rocket force idea was not looked upon favourably by the army. With a joint command structure it can change.
The Import Army don't have any intellectual capability of what they want. They don't know the difference between Tactical Rocket Force and Strategic Rocket Force. Heck, the top brass whether the DRDO or MoD or Indian Forces, they constructed an Ivory tower and locked themselves in without looking what's going on elsewhere.
A True Conventional Rocket Force should stay deep inside our territories at beyond some 500km range and also target enemy deep into their territories at some 500km so that it won't itself be strike first by enemy MLRS or the enemy need disproportionately larger assets of his own to neutralize our own assets. If Indian Top brass is smart they realize that Chinese Bases hosting their Fighter Jets, Tankers are true threats and a Deep Strike Rocket Force is one of the best bang for buck while we wait for AMCA. Even if we take losses if Chinese strike first, our Conventional Rocket Force holds deterrence enough that their entire bases will get obliterated. The components should be
(Iam giving examples and these are equivalents we should have)
Subsonic
1. Tomahawk like Cruise Missile for 1000+km range (Don't know what happened to Nirbhay)
2. A Even bigger Tomahawk or Kalibr kind of missile with 2000+km range
Supersonic
1. Brahmos
Hypersonic
1. Unboosted glide vehicle at some 1500km like DF-ZF
2. Boosted glide vehicle at some 1500km like opfires of USA
3. Unboosted glide vehicle at some 3500km like LRHW of USA - this kind of missile gives us best capability to strike deep into enemy territory while staying in central india.
Ballistic MARV
1. DF-21 for range of like 1500km
2. DF-26 for range of like 5000km(we can target every base in china with this via a conventional warhead and china knows even if we fire them we won't use a nuclear warhead due to no first use policy)
Quasi Ballistic (Stays inside atmosphere <50km)
1. Precision Strike / LORA equivalent 500km range
2. PRALAY(1000km range) this one thing we got right.
The above are for strategic rocket force. A tactical rocket force like chunmoo or HIMARS with upcoming precision strike missile perhaps extend range to atmost 500km but they are not true rocket force. Perhaps UN Genrols thought rocket force is just rockets in MLRS and not deep strike. If only they inherited some intellectual capability from foreign militaries along with foreign maal.