in clear : do you have an indigenous small engine not fuel gridy for your own products? It is one key.
Do you have indigenous autonomous end course seeker for metric accuracy ?
I say that because these two points was key for the SCALP program. ie We had small turbines, but too thirsty to have a correct range (or need to increase the missile size). So I think it may be two difficulty for Indian missile industry.
Engine part is being worked upon , stfe (current nirbhay missile's engine ) is not the only choice , more smaller engine are worked upon , some engine for uav can be derived to be used , look for kalyani engines , some indian institutes are also developing their engines , combining efforts of all for a reliable engine would be economical , also seeker part is being a part of active research , they are developing most type of research one by one , it takes time for indigenous product development
