If you have engineer degree and a lot of money you could buy ASIC miner disassemble it and reverse engineer.
And why would you even bother. Only to satisfy your sense of curiosity and accomplishment I guess.
And all you would have is metal tube and a pile of parts. The key part of a miner is the circuitry inside the ASIC's and one is NOT going to reverse engineer that without several 100k$ worth of SEM gear to look at the pattern layers after decapping the chips followed by needing several million$ to even get a foundry to talk to you about making your knock-off chips.