None what so ever. Not all the holes are drilled in the "bolt in" kit. I drilled for the side rails after install.. so i could remove them later if needed- like to remove the seats or something. At all the joints, there is an additional sleeve that is to be drilled once all pieces are in place- you drill the sleeve ..all the way through to the cage tubes. I instead decided to tack weld all the pieces together to ensure proper positioning. after all position of forward/backward/ left & right, I marked the floor foor drilling for the mounting bolts. I also used sealer on the bottom side plates to prevent an water or corrosing( then went over with undercoating at the end of the project).
Then I welded it all- I welded the sleeves to the cage. Then of course wrapped all the places my body could hit with the padding.
IT really improved the rigidity of the car. I suppose the hardest part was the rear wheel well points. Sliding them on to the cage was tedieous and a pain.- they must be done in the car- after putting in the rear hoop. I suggest smoothing any rough edges on socket joints by sanding- then use much grease>> these points were almost a press-fit.
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Putting this cage in with carpet would be more tricky- but don't bolt this in over the carpet- it wont end up as rigid. If i had done this, I think i would have determined the center point of the mounting tubes > made a length-wise(inline with car) cut against the rockers, next to where the cage is sitting on the carpet. Then a horizontal cut toward the tube and base plate- to center of tube. Last, used a hole saw (same size as tube) and center point. Fit the base plates through the carpet, re-align cage in car, mark floor board, drill, bolt, then work on mounting the roof bars.
if you plane to weld, remove any paint 1-1 1/2" back from all joint locations and on sleeves. tape the areas before painting cage desired color
-All seats will have to be removed first-
1> start with main hoop (behind front seats). placing it in car
2 >fit rear wheel well down tubes. drill for these later.
get the main hoop with rear bars as far back as possible- touching the wheel wells.
measure- make sure the main hoop is equal distance on both sides from the sides of the car @ floor.. and equall on both sides from the back seat section.-about 2 1/2" on my car from seat/gas tank area.
3 >put in front tubes- in this case, the over door tube is the same as the front down tube. for reference, the front tubes end up about 3/8 - 1/2" from the dash.
4 >be sure you slid the sleeves on. slide them over the joint.
5> check fitment of the roof tube over windshield- move door tubes inward equally until the roof tube touches the the door/dash tubes. slide the sleevs over the joint- rotate the pointed center until it is aiming foward.
6> if you like everything tack it all into place -- then either drill or weld all together- skip from side to side doing same locations after each other-- so no twisting or weird wandering happens.
I mounted the main rear hoop fitted with rear wheel well bars first- mounting it to the floor- I did this so I had a secure reference for all other points.
Maybe others have more ideas.. and suggestions. This worked well for me.
The fitment of the cage was decent for a kit. plenty of room for sunroof cars (specify this when ordering) | 
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