Gulf War: Iraq invades Saudi Arabia right after invading Kuwait and succeds

[OSR stands with Israel]

After Invading in Aug 5 1990 Saudi Arabia falls in 4-6 weeks and  how would it affect these things in the war

Which country would let US and Coalition forces build up in

Would it require a D Day style landing to take back Saudi Arabia

Would it make the Gulf War more of a Ground War instead of an Air War

Would it cost US and Coalition thousands of lives to liberate Saudi Arabia and Kuwait

Would US and Coalition forces including the Arab ones go all the way and remove Saddam Hussein and  the Baath Party from Power

If they do remove Saddam Hussein would US and Coalition forces able to stabilize Iraq due to having over 750, 000 troops instead of just having 150000 like they did in 2003

[OSR stands with Israel]

There's a pretty massive desert between the most populated parts of Saudi Arabia and Iraq. I could see big chunks of the coast of eastern Saudi Arabia occupied by the Iraqi army, but I don't see how the Iraqi army takes Riyadh in six weeks, let alone the Hedjaz.

Saudi Arabia had a really weak military in 1990 . All Iraq needs to do is blitzkrieg and they reach the capital and force the Saudi Government to run away like France in 1940. Iraq had a military over one million men who were very ruthless and evil which would stop the Saudis from forming an insurgency of so they possibly can hold Saudi Arabia. There's no doubt they will get Crushed by the Americans though once the US comes and Saddam is probably disposed in 1991 and taken to the Hague and convicted for War Crimes and Crimes against Humanity . I just want to know what would happen to the things I stated.

[OSR stands with Israel]

How about parachuters?

As the OP said the Saudi military was pretty weak back then, so it would not take large forces.

Still, if they really wanted to conquer Saudi-Arabia they would need enough naval/amphibian capability to attack from the Red Sea simultaneously with the invasion of Kuwait (before the US could block them) - and they only had a collection of patrol boats etc.

If the Capital quickly falls the rest of the Country(For a country like Saudi Arabia) falls like a house of cards. For example if the Germans captured Moscow they would have won the war. If Saudi's Capital fell they would have had most of the Country under control as they would then controll all the major Oil fields.

[OSR stands with Israel]

Hopefully the US would stay out and let Saudi regime get what it deserves.

i dont think the US would let Suddam control nearly half the world's Oil fields. With that much oil he can hold the rest of the world at ransom which could cause another 1973 crash