indranilsen, the devise that has to be level to prevent skating forces is the tonearm. So the best place to put your bubble level is on the tonearm board or plinth right at the base of the tonearm. If the platter is a tiny bit off it won't matter.
It is absolutely possible to completely eliminate footfall sensitivity. It just requires careful engineering. Any of the suspended Sota's, SME's and Basis turntables will do this. I can take a Sota Sapphire put it on a collapsible card table on a wooden floor, jump up and down in front of it and absolutely nothing will happen other than the suspension bobbing just a little. If you put a MinusK platform under your turntable you will get the same result. Can you make a suspension that will work as well? Absolutely. But, you will have some work to do and you will have to spend some money. I have a design for a suspended platform in my head. The form is easy. It is getting the right spring rates for a given weight and applying damping that are the difficult part. I would use a quartz solid surface material laminated to MDF. This makes a very well damped panel for the base and platform. The spring hangers would be 1" aluminum laser cut to shape, drilled and tapped then anodized. These would be mounted on the base at the corners and the platform hung from them with the springs. On the bottom of the platform I would mount paddles at each corner which extend into cups mounted on the base. These cups would be filled with a viscous oil to provide damping. Soft rubber boots hung from the platform extending over the cups will provide a seal to keep dust out of the oil. There you have it. I should think it could be built for $500 in materials.
It is absolutely possible to completely eliminate footfall sensitivity. It just requires careful engineering. Any of the suspended Sota's, SME's and Basis turntables will do this. I can take a Sota Sapphire put it on a collapsible card table on a wooden floor, jump up and down in front of it and absolutely nothing will happen other than the suspension bobbing just a little. If you put a MinusK platform under your turntable you will get the same result. Can you make a suspension that will work as well? Absolutely. But, you will have some work to do and you will have to spend some money. I have a design for a suspended platform in my head. The form is easy. It is getting the right spring rates for a given weight and applying damping that are the difficult part. I would use a quartz solid surface material laminated to MDF. This makes a very well damped panel for the base and platform. The spring hangers would be 1" aluminum laser cut to shape, drilled and tapped then anodized. These would be mounted on the base at the corners and the platform hung from them with the springs. On the bottom of the platform I would mount paddles at each corner which extend into cups mounted on the base. These cups would be filled with a viscous oil to provide damping. Soft rubber boots hung from the platform extending over the cups will provide a seal to keep dust out of the oil. There you have it. I should think it could be built for $500 in materials.