From your description, it sounds like you have the right idea. You want to run your vent from your fixture arm (the p-trap) then tie it anywhere into your other vent as long as its above the flood rim of your floor drain and you use fittings and put in grade so that your vents can empty of any water by gravity. Let me know if that makes sense -- sometimes trying to explain plumbing is an exercise in futility. Pictures are better *s*

"About 1 meter under the shower there is a standard P-trap" If it is really a 1 meter drop that is longer than allowed. Most of the drains you describe turn 90 degrees to remain in an 'open' position.

Unfortunately the answer to both of your questions is "No". All fixture discharging into a sewage ejector receptor Must Be vented in the usual manner as defined for DWV applications prior to discharging into the receiver. The only exception to this rule is in the case of certain fixtures such as dedicated up-flush toilets that have a built in sewage ejector system. Sewage ejector pumps occupy a totally separate section of the code and the restrictions are firm. Technically speaking a sewage ejector pump should be more aptly called a "Lift Station" because the code requires a number of features in addition to the pump itself. First of all, a sewage ejector pump MUST BE housed in an approved watertight enclosure that is equipped with a removable service access cover and a separate vent through the roof of the structure. This vent may not be combined with any other venting within the structure. Sewage ejector pumps may or may not be equipped with a macerator however only pumps specifically manufactured for the purpose of a sewage ejector may be used. If the pump is not equipped with a macerator feature the pump must be capable of passing 2" diameter solids. By definition a macerator is a grinder feature that can reduce solids to slurry before passing through the pump. Under the International Residential Code (IRC 3007.1) the minimum permissible discharge rate of a sewage ejector pump must be 1.9ft/sec, which is equal to 14.2gal/min. Under the International Residential Code the gravity flow drain receiving the discharge from a sewage ejector pump must be sized at the rate of 1.5DFUs for each GPM of the pump. This means the minimum DFU load of a sewage ejector pump would be 14.2gpm x 1.5DFU = 21.3DFUÂs. Under the Uniform Plumbing code (UPC 710.3.1) the minimum permissible discharge rate of a sewage ejector pump must be 20gal/min. Under the Uniform Plumbing code (UPC 710.5) the gravity flow drain receiving the discharge from a sewage ejector pump must be sized at the rate of 2 DFUÂs for each GPM of the pump. Under the Uniform Plumbing code the minimum DFU load would be 20gpm x 2DFU = 40 DFUÂs. When combining the discharge of a sewage ejector pump with an existing drain we must first determine the existing load on that said drain line, then add the DFU load of the pump to determine the combined aggregate load. Under the IRC the maximum number of DFUÂs permitted on a 3" branch line is 20DFUÂs while the minimum output of a sewage ejector would be 21.3DFUÂs. Therefore the sewage ejector pump discharge itself would be greater than the total load permitted on a 3" branch line, never mind the pre-existing load on that line. A 3" Main drain or building sewer is rated for a maximum of 36DFU while the sewage ejector is rated at 21.3DFUÂs therefore the pre-existing load on the 3" main drain may not exceed 14.7DFUÂs. Now considering that a bathroom group is 6DFU, a kitchen is 3DFUÂs and a laundry is 3DFUÂs. If the house has more than one bathroom and a 3" main drain or sewer you would be required to increase the size of the main drain and sewer line to add a sewage ejector pump. In your case your Main Drain and sewer are 4", which is rated for a maximum of 180DFUÂs so if you install a sewage ejector you will be required to connect it directly to the 4" main drain line. While the UPC assigns slightly different DFU values to the lines and fixtures in the final analysis it works out the same way.

Yes There were drawings but nothing saying width between toilet and knee wall or cabinet The illustration just shows the toilet centered between the two side elements The cabinetry was changed so that there is more space on cabinet side...don't know specifics of what but guess the drawer stack is 12"... But just another strike against this person we chose for cabinets as far as I am concerned... She asked the tile guy " where did I get that number?"