Yup.. looking for something like that. Just want to know if there will be any major issues with my equipment.
Thanks
Major issues? Well, you aren't going to damage anything, if that's what you mean. But, as TLS says, the diffraction step loss compensation will definitely be thrown out of whack. So, the frequency response will likely be severely affected. As Bryan suggested, absorption material placed behind and around the speakers could help, but the cabinetry is still very close to the speakers. Don't expect it to be a miracle cure.
Some people have dedicated listening rooms and don't have to make compromises when it comes to room acoustics and equipment placement. Then there are those of us, like you, who have to live in the "real world" and there are certain compromises that we cannot overcome and we have to live with the results. That's life.
To learn with more accuracy, how your frequency response will be affected, you could get yourself a set of test tones and a SPL meter. Then before the cabinets are built, plot the FR you have now. Then after the cabinets are built, try it again. Then you will see to what degree, the FR is affected by the cabinets.
If you're like me, there is no way you will be able to determine the effects of the cabinetry by ear alone. Despite what some "Golden Ears" might say, aural memory is very short and you will have great difficulty conducting an accurate mental comparison between what "was" and what "is". If you have it plotted on a graph, you don't have to remember.
Good luck!