I have a T61 I think B or C (wayteq xbook) and for me play store is working good, initially installed with the e-reader kit from this forum that installs root, play store and xposed but now I switched to FOV's custom ROM port from C67ML and that has play store pre-installed.
You could also try to get the latest apk for flashfire and install that then use flashfire to flash a 4.2 gapps zip but I really would recommend switching to FOV's ROM because that has "no refresh" mode and fixed most black on black/white on white issues.
Or wait for a while as I plan to release my own thing, have given up on trying to build CM or zip-port it because it seems I just lack the needed rk knowledge and even after researching things I still didn't manage to fix my problems (either not booting or no display-even with the right modules in place) but am modifying the C67ML firmware myself to add some AOSP type features and other tweaks. But then again don't expect that to be soon as I don't have a lot of free time to tinker with this and at the same time trying to build some things for my old tablet.
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