I have a question: Is the In-flight refueling probe on the LCA retractable? It will be an awfully tight fit in that nose cone. Fuel line, retraction mechanism if retractable, probe, radar, parts of the cannon, I would suspect the gun/cannon will be near the centreline as it is a single cannon, CM issues as Rahul M points out.
A poster remarked one should go ahead and grant FOC to the LCA without cannons, BVR and retro-fit. This is an intrinsically bad idea, even historically. First as Rahul M has amply pointed out, that the gun recoil may not pass through the CM and thus may create instabilities in the weapons platform. In addition there are vibration issues as pointed by Shiv. These over time if not taken care of weaken the airframe and of course the FBW has to be modified to account for the recoil not passing through the CM, and thereby achieving a stable platform when the guns operate. This may be a simple fix for one aircraft, but to fix many, may invite another round of breast beating that ADA are morons and did not understand and anticipate these issues and thus have proved to be a burden on the exchequer.
Secondly, historically the F4-Phantom was inducted into the Armed Forces of the US without a cannon. Later in hindsight a cannon was added. The prevailing thought being that missiles would rule the day in future air wars. That doctrine was shown to be wrong in Vietnam. Vietnam showed two things. First, cannons were important, aircraft armed by missiles do not rule the skies and second, close in dogfighting skills are absolutely necessary. Thus the US set up its Topgun school. There is a famous anti-Indian congressman who is a decorated Vietnam vet and was behind bars who was involved in a dogfight that amply illustrated the dangerous idea of sending planes into combat without a working cannon. His name is Randall Duke Cunningham and he set up the Topgun school based on his experiences in 'Nam. Thus flying LCA's without cannons and even more so without BVR capability is flouting the lessons of history. Even the simple expedient of painting the enemy aircraft with radar and a BVR threat, has kept the Pakistanis at bay at Kargil, older veteran forumers will recall this from the heady days on this forum during Ops Safedsagar, you can hear a pilot on Akash Yodha declaiming this fact. The following video amply illustrates why cannons are as important in the setting of today's aerial warfare as they were in World War 1 and for Indra Lal Roy:
Listen to the opening lines " Pilots still need to put lead on target to survive."The Gun Kills of VietnamDuke Cunningham
Again I am confident there are forumers here who may have more insight into these matters than I have and may wish to add pertinent viewpoints or maybe these points have already been elaborated in the past, and for that I am sorry to waste the time of the cognoscenti.